tests

QWERTYkez.Mensura.Generator/UnitGenerator.cs

@@ -577,6 +577,498 @@ public readonly partial record struct {typeName} : IMensuraUnit<{typeName}>, IEq
     public static {typeName}[] operator /({typeName}? T1, UInt128[] T2) => T1.ProtectedU().Div(T2.ToDouble());
     public static {typeName}?[] operator /({typeName}? T1, UInt128?[] T2) => T1.ProtectedU().Div(T2.ToDouble());
 #endif
+
+
+
+
+
+
+
+    public static List<{typeName}> operator +(List<{typeName}> T1, {typeName} T2) => T1.Plus(T2._Value);
+    public static List<{typeName}?> operator +(List<{typeName}?> T1, {typeName} T2) => T1.Plus(T2._Value);
+    public static List<{typeName}> operator +({typeName} T1, List<{typeName}> T2) => T1._Value.Plus(T2);
+    public static List<{typeName}?> operator +({typeName} T1, List<{typeName}?> T2) => T1._Value.Plus(T2);
+    public static List<{typeName}> operator +(List<{typeName}> T1, {typeName}? T2) => T1.Plus(T2.Protected());
+    public static List<{typeName}?> operator +(List<{typeName}?> T1, {typeName}? T2) => T1.Plus(T2.Protected());
+    public static List<{typeName}> operator +({typeName}? T1, List<{typeName}> T2) => T1.Protected().Plus(T2);
+    public static List<{typeName}?> operator +({typeName}? T1, List<{typeName}?> T2) => T1.Protected().Plus(T2);
+
+    public static List<{typeName}> operator -(List<{typeName}> T1, {typeName} T2) => T1.Minus(T2._Value);
+    public static List<{typeName}?> operator -(List<{typeName}?> T1, {typeName} T2) => T1.Minus(T2._Value);
+    public static List<{typeName}> operator -({typeName} T1, List<{typeName}> T2) => T1._Value.Minus(T2);
+    public static List<{typeName}?> operator -({typeName} T1, List<{typeName}?> T2) => T1._Value.Minus(T2);
+    public static List<{typeName}> operator -(List<{typeName}> T1, {typeName}? T2) => T1.Minus(T2.Protected());
+    public static List<{typeName}?> operator -(List<{typeName}?> T1, {typeName}? T2) => T1.Minus(T2.Protected());
+    public static List<{typeName}> operator -({typeName}? T1, List<{typeName}> T2) => T1.Protected().Minus(T2);
+    public static List<{typeName}?> operator -({typeName}? T1, List<{typeName}?> T2) => T1.Protected().Minus(T2);
+
+    public static List<double> operator /({typeName} T1, List<{typeName}> T2) => T1.Div(T2);
+    public static List<double?> operator /({typeName} T1, List<{typeName}?> T2) => T1.Div(T2);
+    public static List<double> operator /(List<{typeName}> T1, {typeName} T2) => T1.Div(T2);
+    public static List<double?> operator /(List<{typeName}?> T1, {typeName} T2) => T1.Div(T2);
+    public static List<double> operator /({typeName}? T1, List<{typeName}> T2) => T1.ProtectedU().Div(T2);
+    public static List<double?> operator /({typeName}? T1, List<{typeName}?> T2) => T1.ProtectedU().Div(T2);
+    public static List<double> operator /(List<{typeName}> T1, {typeName}? T2) => T1.Div(T2.ProtectedU());
+    public static List<double?> operator /(List<{typeName}?> T1, {typeName}? T2) => T1.Div(T2.ProtectedU());
+
+
+    // double
+    public static List<{typeName}> operator *({typeName} T1, List<double> T2) => T1.Mul(T2);
+    public static List<{typeName}?> operator *({typeName} T1, List<double?> T2) => T1.Mul(T2);
+    public static List<{typeName}> operator *({typeName}? T1, List<double> T2) => T1.ProtectedU().Mul(T2);
+    public static List<{typeName}?> operator *({typeName}? T1, List<double?> T2) => T1.ProtectedU().Mul(T2);
+    public static List<{typeName}> operator *(List<double> T1, {typeName} T2) => T1.Mul(T2);
+    public static List<{typeName}?> operator *(List<double?> T1, {typeName} T2) => T1.Mul(T2);
+    public static List<{typeName}> operator *(List<double> T1, {typeName}? T2) => T1.Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<double?> T1, {typeName}? T2) => T1.Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<double> T2) => T1.Div(T2);
+    public static List<{typeName}?> operator /({typeName} T1, List<double?> T2) => T1.Div(T2);
+    public static List<{typeName}> operator /({typeName}? T1, List<double> T2) => T1.ProtectedU().Div(T2);
+    public static List<{typeName}?> operator /({typeName}? T1, List<double?> T2) => T1.ProtectedU().Div(T2);
+
+    // sbyte
+    public static List<{typeName}> operator *({typeName} T1, List<sbyte> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<sbyte?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<sbyte> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<sbyte?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<sbyte> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<sbyte?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<sbyte> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<sbyte?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<sbyte> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<sbyte?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<sbyte> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<sbyte?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // short
+    public static List<{typeName}> operator *({typeName} T1, List<short> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<short?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<short> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<short?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<short> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<short?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<short> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<short?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<short> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<short?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<short> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<short?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // int
+    public static List<{typeName}> operator *({typeName} T1, List<int> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<int?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<int> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<int?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<int> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<int?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<int> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<int?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<int> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<int?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<int> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<int?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // long
+    public static List<{typeName}> operator *({typeName} T1, List<long> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<long?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<long> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<long?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<long> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<long?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<long> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<long?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<long> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<long?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<long> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<long?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // byte
+    public static List<{typeName}> operator *({typeName} T1, List<byte> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<byte?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<byte> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<byte?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<byte> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<byte?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<byte> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<byte?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<byte> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<byte?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<byte> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<byte?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // ushort
+    public static List<{typeName}> operator *({typeName} T1, List<ushort> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<ushort?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<ushort> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<ushort?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<ushort> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<ushort?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<ushort> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<ushort?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<ushort> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<ushort?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<ushort> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<ushort?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // uint
+    public static List<{typeName}> operator *({typeName} T1, List<uint> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<uint?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<uint> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<uint?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<uint> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<uint?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<uint> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<uint?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<uint> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<uint?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<uint> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<uint?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // ulong
+    public static List<{typeName}> operator *({typeName} T1, List<ulong> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<ulong?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<ulong> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<ulong?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<ulong> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<ulong?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<ulong> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<ulong?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<ulong> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<ulong?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<ulong> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<ulong?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // nint
+    public static List<{typeName}> operator *({typeName} T1, List<nint> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<nint?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<nint> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<nint?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<nint> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<nint?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<nint> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<nint?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<nint> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<nint?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<nint> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<nint?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // nuint
+    public static List<{typeName}> operator *({typeName} T1, List<nuint> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<nuint?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<nuint> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<nuint?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<nuint> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<nuint?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<nuint> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<nuint?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<nuint> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<nuint?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<nuint> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<nuint?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // float
+    public static List<{typeName}> operator *({typeName} T1, List<float> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<float?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<float> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<float?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<float> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<float?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<float> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<float?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<float> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<float?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<float> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<float?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // decimal
+    public static List<{typeName}> operator *({typeName} T1, List<decimal> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<decimal?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<decimal> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<decimal?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<decimal> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<decimal?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<decimal> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<decimal?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<decimal> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<decimal?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<decimal> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<decimal?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+#if NET7_0_OR_GREATER
+    // Int128
+    public static List<{typeName}> operator *({typeName} T1, List<Int128> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<Int128?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<Int128> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<Int128?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<Int128> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<Int128?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<Int128> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<Int128?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<Int128> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<Int128?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<Int128> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<Int128?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // UInt128
+    public static List<{typeName}> operator *({typeName} T1, List<UInt128> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName} T1, List<UInt128?> T2) => T1.Mul(T2.ToDouble());
+    public static List<{typeName}> operator *({typeName}? T1, List<UInt128> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}?> operator *({typeName}? T1, List<UInt128?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static List<{typeName}> operator *(List<UInt128> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}?> operator *(List<UInt128?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static List<{typeName}> operator *(List<UInt128> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}?> operator *(List<UInt128?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static List<{typeName}> operator /({typeName} T1, List<UInt128> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName} T1, List<UInt128?> T2) => T1.Div(T2.ToDouble());
+    public static List<{typeName}> operator /({typeName}? T1, List<UInt128> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static List<{typeName}?> operator /({typeName}? T1, List<UInt128?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+#endif
+
+
+
+
+
+
+
+    public static IEnumerable<{typeName}> operator +(IEnumerable<{typeName}> T1, {typeName} T2) => T1.Plus(T2._Value);
+    public static IEnumerable<{typeName}?> operator +(IEnumerable<{typeName}?> T1, {typeName} T2) => T1.Plus(T2._Value);
+    public static IEnumerable<{typeName}> operator +({typeName} T1, IEnumerable<{typeName}> T2) => T1._Value.Plus(T2);
+    public static IEnumerable<{typeName}?> operator +({typeName} T1, IEnumerable<{typeName}?> T2) => T1._Value.Plus(T2);
+    public static IEnumerable<{typeName}> operator +(IEnumerable<{typeName}> T1, {typeName}? T2) => T1.Plus(T2.Protected());
+    public static IEnumerable<{typeName}?> operator +(IEnumerable<{typeName}?> T1, {typeName}? T2) => T1.Plus(T2.Protected());
+    public static IEnumerable<{typeName}> operator +({typeName}? T1, IEnumerable<{typeName}> T2) => T1.Protected().Plus(T2);
+    public static IEnumerable<{typeName}?> operator +({typeName}? T1, IEnumerable<{typeName}?> T2) => T1.Protected().Plus(T2);
+
+    public static IEnumerable<{typeName}> operator -(IEnumerable<{typeName}> T1, {typeName} T2) => T1.Minus(T2._Value);
+    public static IEnumerable<{typeName}?> operator -(IEnumerable<{typeName}?> T1, {typeName} T2) => T1.Minus(T2._Value);
+    public static IEnumerable<{typeName}> operator -({typeName} T1, IEnumerable<{typeName}> T2) => T1._Value.Minus(T2);
+    public static IEnumerable<{typeName}?> operator -({typeName} T1, IEnumerable<{typeName}?> T2) => T1._Value.Minus(T2);
+    public static IEnumerable<{typeName}> operator -(IEnumerable<{typeName}> T1, {typeName}? T2) => T1.Minus(T2.Protected());
+    public static IEnumerable<{typeName}?> operator -(IEnumerable<{typeName}?> T1, {typeName}? T2) => T1.Minus(T2.Protected());
+    public static IEnumerable<{typeName}> operator -({typeName}? T1, IEnumerable<{typeName}> T2) => T1.Protected().Minus(T2);
+    public static IEnumerable<{typeName}?> operator -({typeName}? T1, IEnumerable<{typeName}?> T2) => T1.Protected().Minus(T2);
+
+    public static IEnumerable<double> operator /({typeName} T1, IEnumerable<{typeName}> T2) => T1.Div(T2);
+    public static IEnumerable<double?> operator /({typeName} T1, IEnumerable<{typeName}?> T2) => T1.Div(T2);
+    public static IEnumerable<double> operator /(IEnumerable<{typeName}> T1, {typeName} T2) => T1.Div(T2);
+    public static IEnumerable<double?> operator /(IEnumerable<{typeName}?> T1, {typeName} T2) => T1.Div(T2);
+    public static IEnumerable<double> operator /({typeName}? T1, IEnumerable<{typeName}> T2) => T1.ProtectedU().Div(T2);
+    public static IEnumerable<double?> operator /({typeName}? T1, IEnumerable<{typeName}?> T2) => T1.ProtectedU().Div(T2);
+    public static IEnumerable<double> operator /(IEnumerable<{typeName}> T1, {typeName}? T2) => T1.Div(T2.ProtectedU());
+    public static IEnumerable<double?> operator /(IEnumerable<{typeName}?> T1, {typeName}? T2) => T1.Div(T2.ProtectedU());
+
+
+    // double
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<double> T2) => T1.Mul(T2);
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<double?> T2) => T1.Mul(T2);
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<double> T2) => T1.ProtectedU().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<double?> T2) => T1.ProtectedU().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<double> T1, {typeName} T2) => T1.Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<double?> T1, {typeName} T2) => T1.Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<double> T1, {typeName}? T2) => T1.Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<double?> T1, {typeName}? T2) => T1.Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<double> T2) => T1.Div(T2);
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<double?> T2) => T1.Div(T2);
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<double> T2) => T1.ProtectedU().Div(T2);
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<double?> T2) => T1.ProtectedU().Div(T2);
+
+    // sbyte
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<sbyte> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<sbyte?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<sbyte> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<sbyte?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<sbyte> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<sbyte?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<sbyte> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<sbyte?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<sbyte> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<sbyte?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<sbyte> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<sbyte?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // short
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<short> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<short?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<short> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<short?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<short> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<short?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<short> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<short?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<short> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<short?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<short> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<short?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // int
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<int> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<int?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<int> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<int?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<int> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<int?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<int> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<int?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<int> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<int?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<int> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<int?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // long
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<long> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<long?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<long> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<long?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<long> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<long?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<long> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<long?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<long> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<long?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<long> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<long?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // byte
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<byte> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<byte?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<byte> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<byte?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<byte> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<byte?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<byte> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<byte?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<byte> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<byte?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<byte> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<byte?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // ushort
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<ushort> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<ushort?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<ushort> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<ushort?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<ushort> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<ushort?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<ushort> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<ushort?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<ushort> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<ushort?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<ushort> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<ushort?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // uint
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<uint> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<uint?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<uint> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<uint?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<uint> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<uint?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<uint> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<uint?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<uint> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<uint?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<uint> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<uint?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // ulong
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<ulong> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<ulong?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<ulong> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<ulong?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<ulong> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<ulong?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<ulong> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<ulong?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<ulong> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<ulong?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<ulong> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<ulong?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // nint
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<nint> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<nint?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<nint> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<nint?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<nint> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<nint?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<nint> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<nint?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<nint> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<nint?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<nint> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<nint?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // nuint
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<nuint> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<nuint?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<nuint> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<nuint?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<nuint> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<nuint?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<nuint> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<nuint?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<nuint> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<nuint?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<nuint> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<nuint?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // float
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<float> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<float?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<float> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<float?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<float> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<float?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<float> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<float?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<float> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<float?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<float> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<float?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // decimal
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<decimal> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<decimal?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<decimal> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<decimal?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<decimal> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<decimal?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<decimal> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<decimal?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<decimal> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<decimal?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<decimal> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<decimal?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+#if NET7_0_OR_GREATER
+    // Int128
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<Int128> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<Int128?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<Int128> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<Int128?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<Int128> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<Int128?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<Int128> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<Int128?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<Int128> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<Int128?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<Int128> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<Int128?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+
+    // UInt128
+    public static IEnumerable<{typeName}> operator *({typeName} T1, IEnumerable<UInt128> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName} T1, IEnumerable<UInt128?> T2) => T1.Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *({typeName}? T1, IEnumerable<UInt128> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator *({typeName}? T1, IEnumerable<UInt128?> T2) => T1.ProtectedU().Mul(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator *(IEnumerable<UInt128> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<UInt128?> T1, {typeName} T2) => T1.ToDouble().Mul(T2);
+    public static IEnumerable<{typeName}> operator *(IEnumerable<UInt128> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}?> operator *(IEnumerable<UInt128?> T1, {typeName}? T2) => T1.ToDouble().Mul(T2.ProtectedU());
+    public static IEnumerable<{typeName}> operator /({typeName} T1, IEnumerable<UInt128> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName} T1, IEnumerable<UInt128?> T2) => T1.Div(T2.ToDouble());
+    public static IEnumerable<{typeName}> operator /({typeName}? T1, IEnumerable<UInt128> T2) => T1.ProtectedU().Div(T2.ToDouble());
+    public static IEnumerable<{typeName}?> operator /({typeName}? T1, IEnumerable<UInt128?> T2) => T1.ProtectedU().Div(T2.ToDouble());
+#endif
 }
 
 public static class {typeName}Extensions
@@ -619,16 +1111,6 @@ public static class {typeName}Extensions
     [MethodImpl(MethodImplOptions.AggressiveInlining)] public static List<{typeName}?> Div(
         this double dividend, List<{typeName}?> units) => dividend.Div<{typeName}>(units);
 
-    // === ICollection<T> ===
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Div(this ICollection<{typeName}> units,
-        double divisor, Span<{typeName}> destination) => units.Div<{typeName}>(divisor, destination);
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Div(this ICollection<{typeName}?> units,
-        double divisor, Span<{typeName}?> destination) => units.Div<{typeName}>(divisor, destination);
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Div(this double dividend,
-        ICollection<{typeName}> units, Span<{typeName}> destination) => dividend.Div<{typeName}>(units, destination);
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Div(this double dividend,
-        ICollection<{typeName}?> units, Span<{typeName}?> destination) => dividend.Div<{typeName}>(units, destination);
-
     // === IReadOnlyCollection<T> ===
     [MethodImpl(MethodImplOptions.AggressiveInlining)]public static void Div(this IReadOnlyCollection<{typeName}> units,
         double divisor, Span<{typeName}> destination) => units.Div<{typeName}>(divisor, destination);
@@ -684,16 +1166,6 @@ public static class {typeName}Extensions
     [MethodImpl(MethodImplOptions.AggressiveInlining)] public static List<{typeName}?> Mul(
         this double multiplicator, List<{typeName}?> units) => units.Mul<{typeName}>(multiplicator);
 
-    // === ICollection<T> ===
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Mul(this ICollection<{typeName}> units,
-        double multiplicator, Span<{typeName}> destination) => units.Mul<{typeName}>(multiplicator, destination);
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Mul(this ICollection<{typeName}?> units,
-        double multiplicator, Span<{typeName}?> destination) => units.Mul<{typeName}>(multiplicator, destination);
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Mul(this double multiplicator,
-        ICollection<{typeName}> units, Span<{typeName}> destination) => units.Mul<{typeName}>(multiplicator, destination);
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Mul(this double multiplicator,
-        ICollection<{typeName}?> units, Span<{typeName}?> destination) => units.Mul<{typeName}>(multiplicator, destination);
-
     // === IReadOnlyCollection<T> ===
     [MethodImpl(MethodImplOptions.AggressiveInlining)]public static void Mul(this IReadOnlyCollection<{typeName}> units,
         double multiplicator, Span<{typeName}> destination) => units.Mul<{typeName}>(multiplicator, destination);
@@ -734,12 +1206,6 @@ public static class {typeName}Extensions
     public static {typeName} Max(this List<{typeName}> list) => AggregateUnitExtensions.Max(list);
     public static {typeName} Min(this List<{typeName}> list) => AggregateUnitExtensions.Min(list);
 
-    // === ICollection<T> ===
-    public static {typeName} Sum(this ICollection<{typeName}> collection) => AggregateUnitExtensions.Sum(collection);
-    public static {typeName} Avg(this ICollection<{typeName}> collection) => AggregateUnitExtensions.Avg(collection);
-    public static {typeName} Max(this ICollection<{typeName}> collection) => AggregateUnitExtensions.Max(collection);
-    public static {typeName} Min(this ICollection<{typeName}> collection) => AggregateUnitExtensions.Min(collection);
-
     // === IReadOnlyCollection<T> ===
     public static {typeName} Sum(this IReadOnlyCollection<{typeName}> collection) => AggregateUnitExtensions.Sum(collection);
     public static {typeName} Avg(this IReadOnlyCollection<{typeName}> collection) => AggregateUnitExtensions.Avg(collection);
@@ -770,12 +1236,6 @@ public static class {typeName}Extensions
     public static {typeName} Max(this List<{typeName}?> list) => AggregateUnitExtensions.Max(list);
     public static {typeName} Min(this List<{typeName}?> list) => AggregateUnitExtensions.Min(list);
 
-    // === ICollection<T> ===
-    public static {typeName} Sum(this ICollection<{typeName}?> collection) => AggregateUnitExtensions.Sum(collection);
-    public static {typeName} Avg(this ICollection<{typeName}?> collection) => AggregateUnitExtensions.Avg(collection);
-    public static {typeName} Max(this ICollection<{typeName}?> collection) => AggregateUnitExtensions.Max(collection);
-    public static {typeName} Min(this ICollection<{typeName}?> collection) => AggregateUnitExtensions.Min(collection);
-
     // === IReadOnlyCollection<T> ===
     public static {typeName} Sum(this IReadOnlyCollection<{typeName}?> collection) => AggregateUnitExtensions.Sum(collection);
     public static {typeName} Avg(this IReadOnlyCollection<{typeName}?> collection) => AggregateUnitExtensions.Avg(collection);

QWERTYkez.Mensura.Tests/AggregateUnitExtensions.cs

@@ -0,0 +1,170 @@
+using System.Reflection;
+
+namespace QWERTYkez.Mensura.Tests;
+
+public class AggregateUnitExtensions
+{
+    // Вспомогательный метод для создания объекта Length.
+    // Если у вас используется фабричный метод (например, Length.FromMeters), замените код внутри.
+    private static Length CreateLength(double value) => value * Length._MilliMeter;
+
+    #region Инфраструктура Рефлексии (Invoker)
+
+    private delegate Length SpanDelegate(ReadOnlySpan<Length> units);
+    private delegate Length SpanNullableDelegate(ReadOnlySpan<Length?> units);
+
+    private static class Invoker
+    {
+        private static readonly Type ExtType;
+
+        static Invoker()
+        {
+            // Находим внутренний класс AggregateUnitExtensions в целевой сборке
+            ExtType = typeof(Length).Assembly.GetType("QWERTYkez.Mensura.Extensions.AggregateUnitExtensions")
+                ?? throw new InvalidOperationException("Не удалось найти класс AggregateUnitExtensions через рефлексию.");
+        }
+
+        public static Length InvokeSpan(string methodName, ReadOnlySpan<Length> data)
+        {
+            var method = FindMethod(methodName, typeof(ReadOnlySpan<>), isNullable: false);
+            var closedMethod = method.MakeGenericMethod(typeof(Length));
+            var del = closedMethod.CreateDelegate<SpanDelegate>();
+            return del(data);
+        }
+
+        public static Length InvokeSpanNullable(string methodName, ReadOnlySpan<Length?> data)
+        {
+            var method = FindMethod(methodName, typeof(ReadOnlySpan<>), isNullable: true);
+            var closedMethod = method.MakeGenericMethod(typeof(Length));
+            var del = closedMethod.CreateDelegate<SpanNullableDelegate>();
+            return del(data);
+        }
+
+        public static Length InvokeCollection(string methodName, Type genericContainer, object data, bool isNullable)
+        {
+            var method = FindMethod(methodName, genericContainer, isNullable);
+            var closedMethod = method.MakeGenericMethod(typeof(Length));
+            return (Length)closedMethod.Invoke(null, [data])!;
+        }
+
+        private static MethodInfo FindMethod(string name, Type genericContainerType, bool isNullable)
+        {
+            var methods = ExtType.GetMethods(BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public)
+                .Where(m => m.Name == name);
+
+            foreach (var method in methods)
+            {
+                var parameters = method.GetParameters();
+                if (parameters.Length != 1) continue;
+
+                var paramType = parameters[0].ParameterType;
+                if (!paramType.IsGenericType) continue;
+
+                // Проверяем базовый контейнер (List<>, IEnumerable<>, ReadOnlySpan<>)
+                if (paramType.GetGenericTypeDefinition() != genericContainerType) continue;
+
+                // Проверяем внутренний аргумент типа на Nullable
+                var genericArgument = paramType.GetGenericArguments()[0];
+                bool currentIsNullable = genericArgument.IsGenericType &&
+                                        genericArgument.GetGenericTypeDefinition() == typeof(Nullable<>);
+
+                if (currentIsNullable == isNullable)
+                {
+                    return method;
+                }
+            }
+
+            throw new MethodAccessException($"Метод {name} для контейнера {genericContainerType.Name} (Nullable: {isNullable}) не найден.");
+        }
+    }
+
+    #endregion
+
+    #region Тесты для НЕ-выделяющих Nullable типов (Обычные структуры)
+
+    private readonly Length[] _standardData = [CreateLength(10), CreateLength(20), CreateLength(30)];
+    private readonly Length _expectedSum = CreateLength(60);
+    private readonly Length _expectedAvg = CreateLength(20);
+    private readonly Length _expectedMax = CreateLength(30);
+    private readonly Length _expectedMin = CreateLength(10);
+
+    [Theory]
+    [InlineData("Sum")]
+    [InlineData("Avg")]
+    [InlineData("Max")]
+    [InlineData("Min")]
+    public void StandardContainers_ShouldCalculateCorrectly(string operation)
+    {
+        // Набор ожидаемых значений
+        Length expected = operation switch
+        {
+            "Sum" => _expectedSum,
+            "Avg" => _expectedAvg,
+            "Max" => _expectedMax,
+            "Min" => _expectedMin,
+            _ => throw new ArgumentException(operation)
+        };
+
+        // 1. Тест ReadOnlySpan<T>
+        ReadOnlySpan<Length> span = _standardData;
+        Assert.Equal(expected, Invoker.InvokeSpan(operation, span));
+
+        // 2. Тест List<T>
+        var list = _standardData.ToList();
+        Assert.Equal(expected, Invoker.InvokeCollection(operation, typeof(List<>), list, isNullable: false));
+
+        // 3. Тест IReadOnlyCollection<T>
+        IReadOnlyCollection<Length> readOnlyCollection = _standardData;
+        Assert.Equal(expected, Invoker.InvokeCollection(operation, typeof(IReadOnlyCollection<>), readOnlyCollection, isNullable: false));
+
+        // 4. Тест IEnumerable<T>
+        IEnumerable<Length> enumerable = _standardData.Select(x => x);
+        Assert.Equal(expected, Invoker.InvokeCollection(operation, typeof(IEnumerable<>), enumerable, isNullable: false));
+    }
+
+    #endregion
+
+    #region Тесты для Nullable типов (T?)
+
+    // Тестируем смесь значений с null-элементами
+    private readonly Length?[] _nullableData = [CreateLength(10), null, CreateLength(30)];
+    private readonly Length _expectedNullSum = CreateLength(40);
+    private readonly Length _expectedNullAvg = CreateLength(20); // 40 / 2 значения
+    private readonly Length _expectedNullMax = CreateLength(30);
+    private readonly Length _expectedNullMin = CreateLength(10);
+
+    [Theory]
+    [InlineData("Sum")]
+    [InlineData("Avg")]
+    [InlineData("Max")]
+    [InlineData("Min")]
+    public void NullableContainers_ShouldCalculateCorrectly(string operation)
+    {
+        Length expected = operation switch
+        {
+            "Sum" => _expectedNullSum,
+            "Avg" => _expectedNullAvg,
+            "Max" => _expectedNullMax,
+            "Min" => _expectedNullMin,
+            _ => throw new ArgumentException(operation)
+        };
+
+        // 1. Тест ReadOnlySpan<T?>
+        ReadOnlySpan<Length?> span = _nullableData;
+        Assert.Equal(expected, Invoker.InvokeSpanNullable(operation, span));
+
+        // 2. Тест List<T?>
+        var list = _nullableData.ToList();
+        Assert.Equal(expected, Invoker.InvokeCollection(operation, typeof(List<>), list, isNullable: true));
+
+        // 3. Тест IReadOnlyCollection<T?>
+        IReadOnlyCollection<Length?> readOnlyCollection = _nullableData;
+        Assert.Equal(expected, Invoker.InvokeCollection(operation, typeof(IReadOnlyCollection<>), readOnlyCollection, isNullable: true));
+
+        // 4. Тест IEnumerable<T?>
+        IEnumerable<Length?> enumerable = _nullableData.Select(x => x);
+        Assert.Equal(expected, Invoker.InvokeCollection(operation, typeof(IEnumerable<>), enumerable, isNullable: true));
+    }
+
+    #endregion
+}

QWERTYkez.Mensura.Tests/CastExtensions.cs

@@ -0,0 +1,165 @@
+namespace QWERTYkez.Mensura.Tests;
+
+public class CastExtensions
+{
+    private const double NormalValue1 = 42.42;
+    private const double NormalValue2 = 100.05;
+
+    #region 1. Слабое место: Побитовая идентичность и спец-значения (NaN/Inf)
+    // Так как используется Unsafe.As, нужно убедиться, что битовая сетка double 
+    // не ломается при сохранении пограничных значений (NaN, Infinity).
+
+    [Theory]
+    [InlineData(NormalValue1)]
+    [InlineData(double.NaN)]
+    [InlineData(double.PositiveInfinity)]
+    [InlineData(double.NegativeInfinity)]
+    [InlineData(double.Epsilon)]
+    public void SingleConversion_Should_Preserve_Exact_BitPattern_For_Special_Doubles(double specialValue)
+    {
+        // Act
+        Length unit = specialValue.ToUnit<Length>();
+        double recovered = unit.ToDouble();
+
+        // Assert
+        // Используем BitConverter, чтобы проверить идентичность на уровне битов (особенно важно для NaN)
+        long originalBits = BitConverter.DoubleToInt64Bits(specialValue);
+        long recoveredBits = BitConverter.DoubleToInt64Bits(recovered);
+
+        Assert.Equal(originalBits, recoveredBits);
+    }
+    #endregion
+
+    #region 2. Слабое место: Взрыв CLR при изменении емкости (EnsureCapacity)
+    // При ReCast списков подменяется MethodTable самого списка и его внутреннего массива.
+    // Если мы начнем добавлять элементы, список выделит новый массив через Array.CreateInstance.
+    // Если тип в MethodTable не совпадет с тем, что ожидает среда исполнения, GC или рантайм упадет.
+
+    [Fact]
+    public void List_ReCast_Should_Survive_Massive_Resize_And_GC_Collections()
+    {
+        // Arrange
+        var originalList = new List<Length> { (Length)NormalValue1, (Length)NormalValue2 };
+
+        // Act
+        List<double> morphedList = originalList.ReCast();
+
+        // Провоцируем многократное выделение новой памяти (Resize внутреннего массива)
+        for (int i = 0; i < 100; i++)
+        {
+            morphedList.Add(i * 1.1);
+        }
+
+        // Вызываем сборщик мусора, чтобы проверить, не сошел ли он с ума от нашей подмены
+        GC.Collect();
+        GC.WaitForPendingFinalizers();
+
+        // Assert
+        Assert.Equal(102, morphedList.Count);
+        Assert.Equal(NormalValue1, morphedList[0]);
+        Assert.Equal(10 * 1.1, morphedList[12], 5); // Проверка случайного элемента
+    }
+    #endregion
+
+    #region 3. Слабое место: Ловушка `ArrayTypeMismatchException` при добавлении в WrapAsList
+    // WrapAsList создает фейковый список, подменяя MethodTable исходного массива на double[].
+    // Но когда мы вызываем List.Add(), рантайм внутри делает Array.Copy(). 
+    // Если CLR поймет, что исходный массив физически был массивом структур Length, 
+    // вылетит ArrayTypeMismatchException.
+
+    [Fact]
+    public void WrapAsList_Must_Allow_Adding_Elements_Without_ArrayTypeMismatchException()
+    {
+        // Arrange
+        Length[] sourceArray = [(Length)NormalValue1, (Length)NormalValue2];
+
+        // Act
+        List<double> wrappedList = sourceArray.WrapAsList();
+
+        // Assert
+        // Это действие вызывает внутренний Array.Copy. Самое хрупкое место!
+        var exception = Record.Exception(() => wrappedList.Add(999.99));
+
+        Assert.Null(exception); // Тест провален, если здесь вылетит исключение типа массива
+        Assert.Equal(3, wrappedList.Count);
+        Assert.Equal(999.99, wrappedList[2]);
+    }
+    #endregion
+
+    #region 4. Слабое место: Выравнивание памяти и макет Nullable типов
+    // Структура Nullable<T> в памяти имеет размер больше, чем T (из-за флага HasValue и выравнивания).
+    // Подмена MethodTable для Nullable<Length>[] в Nullable<double>[] — это огромный риск 
+    // смещения байт. Проверяем, что null остается null, а значения не затираются.
+
+    [Fact]
+    public void Nullable_Array_ReCast_Should_Not_Corrupt_Flags_And_Values()
+    {
+        // Arrange
+        Length?[] source = [(Length)NormalValue1, null, (Length)NormalValue2, null];
+
+        // Act
+        double?[] morphed = source.ReCast();
+
+        // Assert
+        Assert.Equal(source.Length, morphed.Length);
+        Assert.Equal(NormalValue1, morphed[0]);
+        Assert.Null(morphed[1]);
+        Assert.Equal(NormalValue2, morphed[2]);
+        Assert.Null(morphed[3]);
+    }
+    #endregion
+
+    #region 5. Слабое место: In-Place мутация (Побочный эффект "Вуду")
+    // Так как ReCast и WrapAsList меняют MethodTable *оригинального* объекта прямо в куче,
+    // старая ссылка на массив Length[] теперь указывает на объект, который думает, что он double[].
+    // Проверяем, как ведет себя оригинальная переменная после этого хака.
+
+    [Fact]
+    public void Verify_InPlace_Mutation_SideEffect_Does_Not_Crash_Old_Reference()
+    {
+        // Arrange
+        Length[] originalArray = [(Length)NormalValue1];
+
+        // Act
+        double[] morphedArray = originalArray.ReCast();
+
+        // Изменяем элемент через НОВЫЙ массив
+        morphedArray[0] = 777.77;
+
+        // Assert
+        // Внимание: из-за жесткой мутации в куче originalArray[0] теперь ТОЖЕ вернет 777.77,
+        // потому что они смотрят на одну память. Главное — чтобы CLR не упал при обращении к старой ссылке.
+        double valueFromOldRef = (double)originalArray[0];
+
+        Assert.Equal(777.77, valueFromOldRef);
+        Assert.Same(originalArray, morphedArray); // Физически это один и тот же объект в памяти
+    }
+    #endregion
+
+    #region 6. Слабое место: Фильтры CLR и оптимизации LINQ
+    // Компилятор и JIT часто оптимизируют методы вроде .Select() или .ToArray(), 
+    // опираясь на тип MethodTable. Проверяем, съедят ли механизмы LINQ наш "поддельный" тип.
+
+    [Fact]
+    public void Morphed_Array_Should_Pass_Through_Linq_And_Native_Sorting_Validations()
+    {
+        // Arrange
+        Length[] originalArray = [(Length)NormalValue2, (Length)NormalValue1]; // [100.05, 42.42]
+
+        // Act
+        double[] morphedArray = originalArray.ReCast();
+
+        // 1. Проверка LINQ фильтрации
+        double[] processedViaLinq = [.. morphedArray.Where(x => x > 50.0)];
+
+        Assert.Single(processedViaLinq);
+        Assert.Equal(NormalValue2, processedViaLinq[0]);
+
+        // 2. Проверка работы встроенной нативной сортировки (Array.Sort использует JIT-оптимизации)
+        var sortException = Record.Exception(() => Array.Sort(morphedArray));
+
+        Assert.Null(sortException);
+        Assert.True(morphedArray[0] < morphedArray[1]); // Теперь [42.42, 100.05]
+    }
+    #endregion
+}

QWERTYkez.Mensura.Tests/CollectionsDivideExtensions.cs

@@ -0,0 +1,292 @@
+namespace QWERTYkez.Mensura.Tests
+{
+    public class CollectionsDivideExtensionsTests
+    {
+        private const double Tolerance = 1e-12;
+        private static readonly Length scalarUnit = Length.Meter;      // 1000 mm
+        private static readonly double scalarDouble = 2.0;
+
+        // Коллекции для тестирования: два элемента
+        private static readonly Length[] unitsArray = [Length.Meter, Length._MilliMeter];
+        private static readonly Length?[] nullableUnitsArray = [Length.Meter, null, Length._MilliMeter];
+        private static readonly List<Length> unitsList = [Length.Meter, Length._MilliMeter];
+        private static readonly List<Length?> nullableUnitsList = [Length.Meter, null, Length._MilliMeter];
+        private static readonly double[] doubleArray = [2.0, 3.0];
+        private static readonly double?[] nullableDoubleArray = [2.0, null, 3.0];
+
+        // ====================== 1. T[] / double ======================
+        [Fact]
+        public void Div_TArray_Double_Returns_TArray()
+        {
+            var result = unitsArray.Div<Length>(scalarDouble);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 / 2.0, (double)result[0], Tolerance);
+            Assert.Equal(1 / 2.0, (double)result[1], Tolerance);
+        }
+
+        // ====================== 2. T?[] / double ======================
+        [Fact]
+        public void Div_NullableTArray_Double_Returns_NullableTArray()
+        {
+            var result = nullableUnitsArray.Div<Length>(scalarDouble);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(1000 / 2.0, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(1 / 2.0, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 3. double / T[] ======================
+        [Fact]
+        public void Div_Double_TArray_Returns_TArray()
+        {
+            var result = scalarDouble.Div<Length>(unitsArray);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(2.0 / 1000, (double)result[0], Tolerance);
+            Assert.Equal(2.0 / 1, (double)result[1], Tolerance);
+        }
+
+        // ====================== 4. double / T?[] ======================
+        [Fact]
+        public void Div_Double_NullableTArray_Returns_NullableTArray()
+        {
+            var result = scalarDouble.Div<Length>(nullableUnitsArray);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(2.0 / 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(2.0 / 1, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 5. List<T> / double ======================
+        [Fact]
+        public void Div_ListT_Double_Returns_ListT()
+        {
+            var result = unitsList.Div<Length>(scalarDouble);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 / 2.0, (double)result[0], Tolerance);
+            Assert.Equal(1 / 2.0, (double)result[1], Tolerance);
+        }
+
+        // ====================== 6. List<T?> / double ======================
+        [Fact]
+        public void Div_ListNullableT_Double_Returns_ListNullableT()
+        {
+            var result = nullableUnitsList.Div<Length>(scalarDouble);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 / 2.0, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(1 / 2.0, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 7. double / List<T> ======================
+        [Fact]
+        public void Div_Double_ListT_Returns_ListT()
+        {
+            var result = scalarDouble.Div<Length>(unitsList);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(2.0 / 1000, (double)result[0], Tolerance);
+            Assert.Equal(2.0 / 1, (double)result[1], Tolerance);
+        }
+
+        // ====================== 8. double / List<T?> ======================
+        [Fact]
+        public void Div_Double_ListNullableT_Returns_ListNullableT()
+        {
+            var result = scalarDouble.Div<Length>(nullableUnitsList);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(2.0 / 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(2.0 / 1, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 9. IReadOnlyCollection<T> / double (Span) ======================
+        [Fact]
+        public void Div_IReadOnlyCollectionT_Double_Span()
+        {
+            Span<Length> dest = new Length[2];
+            ((IReadOnlyCollection<Length>)unitsArray).Div(scalarDouble, dest);
+            Assert.Equal(1000 / 2.0, (double)dest[0], Tolerance);
+            Assert.Equal(1 / 2.0, (double)dest[1], Tolerance);
+        }
+
+        // ====================== 10. IReadOnlyCollection<T?> / double (Span) ======================
+        [Fact]
+        public void Div_IReadOnlyCollectionNullableT_Double_Span()
+        {
+            Span<Length?> dest = new Length?[3];
+            ((IReadOnlyCollection<Length?>)nullableUnitsArray).Div(scalarDouble, dest);
+            Assert.Equal(1000 / 2.0, (double)dest[0]!, Tolerance);
+            Assert.Null(dest[1]);
+            Assert.Equal(1 / 2.0, (double)dest[2]!, Tolerance);
+        }
+
+        // ====================== 11. double / IReadOnlyCollection<T> (Span) ======================
+        [Fact]
+        public void Div_Double_IReadOnlyCollectionT_Span()
+        {
+            Span<Length> dest = new Length[2];
+            scalarDouble.Div((IReadOnlyCollection<Length>)unitsArray, dest);
+            Assert.Equal(2.0 / 1000, (double)dest[0], Tolerance);
+            Assert.Equal(2.0 / 1, (double)dest[1], Tolerance);
+        }
+
+        // ====================== 12. double / IReadOnlyCollection<T?> (Span) ======================
+        [Fact]
+        public void Div_Double_IReadOnlyCollectionNullableT_Span()
+        {
+            Span<Length?> dest = new Length?[3];
+            scalarDouble.Div((IReadOnlyCollection<Length?>)nullableUnitsArray, dest);
+            Assert.Equal(2.0 / 1000, (double)dest[0]!, Tolerance);
+            Assert.Null(dest[1]);
+            Assert.Equal(2.0 / 1, (double)dest[2]!, Tolerance);
+        }
+
+        // ====================== 13. IEnumerable<T> / double ======================
+        [Fact]
+        public void Div_IEnumerableT_Double_Returns_IEnumerableT()
+        {
+            var result = ((IEnumerable<Length>)unitsArray).Div<Length>(scalarDouble).ToList();
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 / 2.0, (double)result[0], Tolerance);
+            Assert.Equal(1 / 2.0, (double)result[1], Tolerance);
+        }
+
+        // ====================== 14. IEnumerable<T?> / double ======================
+        [Fact]
+        public void Div_IEnumerableNullableT_Double_Returns_IEnumerableNullableT()
+        {
+            var result = ((IEnumerable<Length?>)nullableUnitsArray).Div<Length>(scalarDouble).ToList();
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 / 2.0, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(1 / 2.0, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 15. double / IEnumerable<T> ======================
+        [Fact]
+        public void Div_Double_IEnumerableT_Returns_IEnumerableT()
+        {
+            var result = scalarDouble.Div<Length>((IEnumerable<Length>)unitsArray).ToList();
+            Assert.Equal(2, result.Count);
+            Assert.Equal(2.0 / 1000, (double)result[0], Tolerance);
+            Assert.Equal(2.0 / 1, (double)result[1], Tolerance);
+        }
+
+        // ====================== 16. double / IEnumerable<T?> ======================
+        [Fact]
+        public void Div_Double_IEnumerableNullableT_Returns_IEnumerableNullableT()
+        {
+            var result = scalarDouble.Div<Length>((IEnumerable<Length?>)nullableUnitsArray).ToList();
+            Assert.Equal(3, result.Count);
+            Assert.Equal(2.0 / 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(2.0 / 1, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 17. double[] / T ======================
+        [Fact]
+        public void Div_DoubleArray_T_Returns_TArray()
+        {
+            var result = doubleArray.Div(scalarUnit);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(2.0 / 1000, (double)result[0], Tolerance);
+            Assert.Equal(3.0 / 1000, (double)result[1], Tolerance);
+        }
+
+        // ====================== 18. double?[] / T ======================
+        [Fact]
+        public void Div_NullableDoubleArray_T_Returns_NullableTArray()
+        {
+            var result = nullableDoubleArray.Div(scalarUnit);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(2.0 / 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(3.0 / 1000, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 19. T / double[] ======================
+        [Fact]
+        public void Div_T_DoubleArray_Returns_TArray()
+        {
+            var result = scalarUnit.Div(doubleArray);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 / 2.0, (double)result[0], Tolerance);
+            Assert.Equal(1000 / 3.0, (double)result[1], Tolerance);
+        }
+
+        // ====================== 20. T / double?[] ======================
+        [Fact]
+        public void Div_T_NullableDoubleArray_Returns_NullableTArray()
+        {
+            var result = scalarUnit.Div(nullableDoubleArray);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(1000 / 2.0, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(1000 / 3.0, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 21. List<double> / T ======================
+        [Fact]
+        public void Div_ListDouble_T_Returns_ListT()
+        {
+            var list = new List<double> { 2.0, 3.0 };
+            var result = list.Div(scalarUnit);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(2.0 / 1000, (double)result[0], Tolerance);
+            Assert.Equal(3.0 / 1000, (double)result[1], Tolerance);
+        }
+
+        // ====================== 22. List<double?> / T ======================
+        [Fact]
+        public void Div_ListNullableDouble_T_Returns_ListNullableT()
+        {
+            var list = new List<double?> { 2.0, null, 3.0 };
+            var result = list.Div(scalarUnit);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(2.0 / 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(3.0 / 1000, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 23. T / List<double> ======================
+        [Fact]
+        public void Div_T_ListDouble_Returns_ListT()
+        {
+            var list = new List<double> { 2.0, 3.0 };
+            var result = scalarUnit.Div(list);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 / 2.0, (double)result[0], Tolerance);
+            Assert.Equal(1000 / 3.0, (double)result[1], Tolerance);
+        }
+
+        // ====================== 24. T / List<double?> ======================
+        [Fact]
+        public void Div_T_ListNullableDouble_Returns_ListNullableT()
+        {
+            var list = new List<double?> { 2.0, null, 3.0 };
+            var result = scalarUnit.Div(list);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 / 2.0, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(1000 / 3.0, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 25. T / T[] -> double[] ======================
+        [Fact]
+        public void Div_T_TArray_Returns_DoubleArray()
+        {
+            var result = scalarUnit.Div(unitsArray);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 / 1000.0, result[0], Tolerance);
+            Assert.Equal(1000 / 1.0, result[1], Tolerance);
+        }
+
+        // ====================== Дополнительно: пустые коллекции, null аргументы ======================
+        [Fact]
+        public void Div_EmptyArray_ReturnsEmptyArray()
+        {
+            var empty = Array.Empty<Length>();
+            var result = empty.Div<Length>(2.0);
+            Assert.Empty(result);
+        }
+    }
+}

QWERTYkez.Mensura.Tests/CollectionsMinusExtensions.cs

@@ -0,0 +1,337 @@
+namespace QWERTYkez.Mensura.Tests
+{
+    public class CollectionsMinusExtensionsTests
+    {
+        private const double Tolerance = 1e-12;
+        private static readonly Length scalarUnit = Length.Meter;            // 1000 mm
+        private static readonly double scalarDouble = 1000.0;                // уменьшаемое/вычитаемое в мм
+
+        // Коллекции единиц
+        private static readonly Length[] unitsArray = [Length.Meter, Length._MilliMeter];
+        private static readonly Length?[] nullableUnitsArray = [Length.Meter, null, Length._MilliMeter];
+        private static readonly List<Length> unitsList = [Length.Meter, Length._MilliMeter];
+        private static readonly List<Length?> nullableUnitsList = [Length.Meter, null, Length._MilliMeter];
+
+        // Коллекции double
+        private static readonly double[] doubleArray = [500.0, 200.0];          // мм
+        private static readonly double?[] nullableDoubleArray = [500.0, null, 200.0];
+        private static readonly List<double> doubleList = [500.0, 200.0];
+        private static readonly List<double?> nullableDoubleList = [500.0, null, 200.0];
+
+        // ====================== 1. T[] - double (результат T[]) ======================
+        [Fact]
+        public void Minus_TArray_Double_Returns_TArray()
+        {
+            // units - subtrahend
+            var result = unitsArray.Minus<Length>(scalarDouble);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 - 1000, (double)result[0], Tolerance);
+            Assert.Equal(1 - 1000, (double)result[1], Tolerance);
+        }
+
+        [Fact]
+        public void Minus_TArray_Double_ByZero_Works()
+        {
+            var result = unitsArray.Minus<Length>(0.0);
+            Assert.Equal(1000, (double)result[0], Tolerance);
+            Assert.Equal(1, (double)result[1], Tolerance);
+        }
+
+        // ====================== 2. T?[] - double (результат T?[]) ======================
+        [Fact]
+        public void Minus_NullableTArray_Double_Returns_NullableTArray()
+        {
+            var result = nullableUnitsArray.Minus<Length>(scalarDouble);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(1000 - 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(1 - 1000, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 3. double - T[] (результат T[]) ======================
+        [Fact]
+        public void Minus_Double_TArray_Returns_TArray()
+        {
+            var result = scalarDouble.Minus<Length>(unitsArray);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 - 1000, (double)result[0], Tolerance);
+            Assert.Equal(1000 - 1, (double)result[1], Tolerance);
+        }
+
+        // ====================== 4. double - T?[] (результат T?[]) ======================
+        [Fact]
+        public void Minus_Double_NullableTArray_Returns_NullableTArray()
+        {
+            var result = scalarDouble.Minus<Length>(nullableUnitsArray);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(1000 - 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(1000 - 1, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 5. List<T> - double ======================
+        [Fact]
+        public void Minus_ListT_Double_Returns_ListT()
+        {
+            var result = unitsList.Minus<Length>(scalarDouble);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 - 1000, (double)result[0], Tolerance);
+            Assert.Equal(1 - 1000, (double)result[1], Tolerance);
+        }
+
+        // ====================== 6. List<T?> - double ======================
+        [Fact]
+        public void Minus_ListNullableT_Double_Returns_ListNullableT()
+        {
+            var result = nullableUnitsList.Minus<Length>(scalarDouble);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 - 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(1 - 1000, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 7. double - List<T> ======================
+        [Fact]
+        public void Minus_Double_ListT_Returns_ListT()
+        {
+            var result = scalarDouble.Minus<Length>(unitsList);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 - 1000, (double)result[0], Tolerance);
+            Assert.Equal(1000 - 1, (double)result[1], Tolerance);
+        }
+
+        // ====================== 8. double - List<T?> ======================
+        [Fact]
+        public void Minus_Double_ListNullableT_Returns_ListNullableT()
+        {
+            var result = scalarDouble.Minus<Length>(nullableUnitsList);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 - 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(1000 - 1, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 9. IReadOnlyCollection<T> - double (Span) ======================
+        [Fact]
+        public void Minus_IReadOnlyCollectionT_Double_Span()
+        {
+            Span<Length> dest = new Length[2];
+            ((IReadOnlyCollection<Length>)unitsArray).Minus<Length>(scalarDouble, dest);
+            Assert.Equal(1000 - 1000, (double)dest[0], Tolerance);
+            Assert.Equal(1 - 1000, (double)dest[1], Tolerance);
+        }
+
+        // ====================== 10. IReadOnlyCollection<T?> - double (Span) ======================
+        [Fact]
+        public void Minus_IReadOnlyCollectionNullableT_Double_Span()
+        {
+            Span<Length?> dest = new Length?[3];
+            ((IReadOnlyCollection<Length?>)nullableUnitsArray).Minus<Length>(scalarDouble, dest);
+            Assert.Equal(1000 - 1000, (double)dest[0]!, Tolerance);
+            Assert.Null(dest[1]);
+            Assert.Equal(1 - 1000, (double)dest[2]!, Tolerance);
+        }
+
+        // ====================== 11. double - IReadOnlyCollection<T> (Span) ======================
+        [Fact]
+        public void Minus_Double_IReadOnlyCollectionT_Span()
+        {
+            Span<Length> dest = new Length[2];
+            scalarDouble.Minus<Length>((IReadOnlyCollection<Length>)unitsArray, dest);
+            Assert.Equal(1000 - 1000, (double)dest[0], Tolerance);
+            Assert.Equal(1000 - 1, (double)dest[1], Tolerance);
+        }
+
+        // ====================== 12. double - IReadOnlyCollection<T?> (Span) ======================
+        [Fact]
+        public void Minus_Double_IReadOnlyCollectionNullableT_Span()
+        {
+            Span<Length?> dest = new Length?[3];
+            scalarDouble.Minus<Length>((IReadOnlyCollection<Length?>)nullableUnitsArray, dest);
+            Assert.Equal(1000 - 1000, (double)dest[0]!, Tolerance);
+            Assert.Null(dest[1]);
+            Assert.Equal(1000 - 1, (double)dest[2]!, Tolerance);
+        }
+
+        // ====================== 13. IEnumerable<T> - double ======================
+        [Fact]
+        public void Minus_IEnumerableT_Double_Returns_IEnumerableT()
+        {
+            var result = ((IEnumerable<Length>)unitsArray).Minus<Length>(scalarDouble).ToList();
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 - 1000, (double)result[0], Tolerance);
+            Assert.Equal(1 - 1000, (double)result[1], Tolerance);
+        }
+
+        // ====================== 14. IEnumerable<T?> - double ======================
+        [Fact]
+        public void Minus_IEnumerableNullableT_Double_Returns_IEnumerableNullableT()
+        {
+            var result = ((IEnumerable<Length?>)nullableUnitsArray).Minus<Length>(scalarDouble).ToList();
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 - 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(1 - 1000, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 15. double - IEnumerable<T> ======================
+        [Fact]
+        public void Minus_Double_IEnumerableT_Returns_IEnumerableT()
+        {
+            var result = scalarDouble.Minus<Length>((IEnumerable<Length>)unitsArray).ToList();
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 - 1000, (double)result[0], Tolerance);
+            Assert.Equal(1000 - 1, (double)result[1], Tolerance);
+        }
+
+        // ====================== 16. double - IEnumerable<T?> ======================
+        [Fact]
+        public void Minus_Double_IEnumerableNullableT_Returns_IEnumerableNullableT()
+        {
+            var result = scalarDouble.Minus<Length>((IEnumerable<Length?>)nullableUnitsArray).ToList();
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 - 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(1000 - 1, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 17. double[] - T ======================
+        [Fact]
+        public void Minus_DoubleArray_T_Returns_TArray()
+        {
+            var result = doubleArray.Minus(scalarUnit);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(500 - 1000, (double)result[0], Tolerance);
+            Assert.Equal(200 - 1000, (double)result[1], Tolerance);
+        }
+
+        // ====================== 18. double?[] - T ======================
+        [Fact]
+        public void Minus_NullableDoubleArray_T_Returns_NullableTArray()
+        {
+            var result = nullableDoubleArray.Minus(scalarUnit);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(500 - 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(200 - 1000, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 19. T - double[] ======================
+        [Fact]
+        public void Minus_T_DoubleArray_Returns_TArray()
+        {
+            var result = scalarUnit.Minus(doubleArray);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 - 500, (double)result[0], Tolerance);
+            Assert.Equal(1000 - 200, (double)result[1], Tolerance);
+        }
+
+        // ====================== 20. T - double?[] ======================
+        [Fact]
+        public void Minus_T_NullableDoubleArray_Returns_NullableTArray()
+        {
+            var result = scalarUnit.Minus(nullableDoubleArray);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(1000 - 500, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(1000 - 200, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 21. List<double> - T ======================
+        [Fact]
+        public void Minus_ListDouble_T_Returns_ListT()
+        {
+            var result = doubleList.Minus(scalarUnit);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(500 - 1000, (double)result[0], Tolerance);
+            Assert.Equal(200 - 1000, (double)result[1], Tolerance);
+        }
+
+        // ====================== 22. List<double?> - T ======================
+        [Fact]
+        public void Minus_ListNullableDouble_T_Returns_ListNullableT()
+        {
+            var result = nullableDoubleList.Minus(scalarUnit);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(500 - 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(200 - 1000, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 23. T - List<double> ======================
+        [Fact]
+        public void Minus_T_ListDouble_Returns_ListT()
+        {
+            var result = scalarUnit.Minus(doubleList);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 - 500, (double)result[0], Tolerance);
+            Assert.Equal(1000 - 200, (double)result[1], Tolerance);
+        }
+
+        // ====================== 24. T - List<double?> ======================
+        [Fact]
+        public void Minus_T_ListNullableDouble_Returns_ListNullableT()
+        {
+            var result = scalarUnit.Minus(nullableDoubleList);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 - 500, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);
+            Assert.Equal(1000 - 200, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 25. T - T[] -> double[] ======================
+        [Fact]
+        public void Minus_T_TArray_Returns_DoubleArray()
+        {
+            var result = scalarUnit - unitsArray;
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 - 1000, result[0]._Value, Tolerance);
+            Assert.Equal(1000 - 1, result[1]._Value, Tolerance);
+        }
+
+        // Дополнительно: перегрузки, где результат double (без указания R)
+        // Тестируем Minus<T>(T[] units, T subtrahend) – возвращает double[]
+        [Fact]
+        public void Minus_TArray_T_Returns_DoubleArray()
+        {
+            var result = unitsArray - scalarUnit;
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 - 1000, result[0]._Value, Tolerance);
+            Assert.Equal(1 - 1000, result[1]._Value, Tolerance);
+        }
+
+        [Fact]
+        public void Minus_ListT_T_Returns_DoubleList()
+        {
+            var result = unitsList - scalarUnit;
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 - 1000, result[0]._Value, Tolerance);
+            Assert.Equal(1 - 1000, result[1]._Value, Tolerance);
+        }
+
+        // Проверка пустых коллекций
+        [Fact]
+        public void Minus_EmptyArray_ReturnsEmptyArray()
+        {
+            var empty = Array.Empty<Length>();
+            var result = empty.Minus<Length>(5.0);
+            Assert.Empty(result);
+        }
+
+        [Fact]
+        public void Minus_NullArray_ReturnsNull()
+        {
+            Length[] nullArray = null!;
+            var result = nullArray.Minus<Length>(5.0);
+            Assert.Null(result);
+        }
+
+        [Fact]
+        public void Minus_NullList_ReturnsNull()
+        {
+            List<Length> nullList = null!;
+            var result = nullList.Minus<Length>(5.0);
+            Assert.Null(result);
+        }
+    }
+}

QWERTYkez.Mensura.Tests/CollectionsMultiplyExtensions.cs

@@ -0,0 +1,335 @@
+namespace QWERTYkez.Mensura.Tests
+{
+    public class CollectionsMultiplyExtensionsTests
+    {
+        private const double Tolerance = 1e-12;
+        private static readonly Length scalarUnit = Length.Meter;            // 1000 mm
+        private static readonly double scalarDouble = 2.0;
+
+        // Коллекции единиц
+        private static readonly Length[] unitsArray = [Length.Meter, Length._MilliMeter];
+        private static readonly Length?[] nullableUnitsArray = [Length.Meter, null, Length._MilliMeter];
+        private static readonly List<Length> unitsList = [Length.Meter, Length._MilliMeter];
+        private static readonly List<Length?> nullableUnitsList = [Length.Meter, null, Length._MilliMeter];
+
+        // Коллекции double
+        private static readonly double[] doubleArray = [5.0, 3.0];
+        private static readonly double?[] nullableDoubleArray = [5.0, null, 3.0];
+        private static readonly List<double> doubleList = [5.0, 3.0];
+        private static readonly List<double?> nullableDoubleList = [5.0, null, 3.0];
+
+        // ====================== 1. T[] * double ======================
+        [Fact]
+        public void Mul_TArray_Double_Returns_TArray()
+        {
+            var result = unitsArray.Mul<Length>(scalarDouble);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 * 2, (double)result[0], Tolerance);
+            Assert.Equal(1 * 2, (double)result[1], Tolerance);
+        }
+
+        [Fact]
+        public void Mul_TArray_Double_ByZero_Works()
+        {
+            var result = unitsArray.Mul<Length>(0.0);
+            Assert.Equal(0, (double)result[0], Tolerance);
+            Assert.Equal(0, (double)result[1], Tolerance);
+        }
+
+        // ====================== 2. T?[] * double ======================
+        [Fact]
+        public void Mul_NullableTArray_Double_Returns_NullableTArray()
+        {
+            var result = nullableUnitsArray.Mul<Length>(scalarDouble);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(1000 * 2, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // null * 2 = null
+            Assert.Equal(1 * 2, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 3. double * T[] ======================
+        [Fact]
+        public void Mul_Double_TArray_Returns_TArray()
+        {
+            var result = scalarDouble.Mul<Length>(unitsArray);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(2 * 1000, (double)result[0], Tolerance);
+            Assert.Equal(2 * 1, (double)result[1], Tolerance);
+        }
+
+        // ====================== 4. double * T?[] ======================
+        [Fact]
+        public void Mul_Double_NullableTArray_Returns_NullableTArray()
+        {
+            var result = scalarDouble.Mul<Length>(nullableUnitsArray);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(2 * 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // 2 * null = null
+            Assert.Equal(2 * 1, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 5. List<T> * double ======================
+        [Fact]
+        public void Mul_ListT_Double_Returns_ListT()
+        {
+            var result = unitsList.Mul<Length>(scalarDouble);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 * 2, (double)result[0], Tolerance);
+            Assert.Equal(1 * 2, (double)result[1], Tolerance);
+        }
+
+        // ====================== 6. List<T?> * double ======================
+        [Fact]
+        public void Mul_ListNullableT_Double_Returns_ListNullableT()
+        {
+            var result = nullableUnitsList.Mul<Length>(scalarDouble);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 * 2, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // null * 2 = null
+            Assert.Equal(1 * 2, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 7. double * List<T> ======================
+        [Fact]
+        public void Mul_Double_ListT_Returns_ListT()
+        {
+            var result = scalarDouble.Mul<Length>(unitsList);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(2 * 1000, (double)result[0], Tolerance);
+            Assert.Equal(2 * 1, (double)result[1], Tolerance);
+        }
+
+        // ====================== 8. double * List<T?> ======================
+        [Fact]
+        public void Mul_Double_ListNullableT_Returns_ListNullableT()
+        {
+            var result = scalarDouble.Mul<Length>(nullableUnitsList);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(2 * 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // 2 * null = null
+            Assert.Equal(2 * 1, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 9. IReadOnlyCollection<T> * double (Span) ======================
+        [Fact]
+        public void Mul_IReadOnlyCollectionT_Double_Span()
+        {
+            Span<Length> dest = new Length[2];
+            ((IReadOnlyCollection<Length>)unitsArray).Mul<Length>(scalarDouble, dest);
+            Assert.Equal(1000 * 2, (double)dest[0], Tolerance);
+            Assert.Equal(1 * 2, (double)dest[1], Tolerance);
+        }
+
+        // ====================== 10. IReadOnlyCollection<T?> * double (Span) ======================
+        [Fact]
+        public void Mul_IReadOnlyCollectionNullableT_Double_Span()
+        {
+            Span<Length?> dest = new Length?[3];
+            ((IReadOnlyCollection<Length?>)nullableUnitsArray).Mul<Length>(scalarDouble, dest);
+            Assert.Equal(1000 * 2, (double)dest[0]!, Tolerance);
+            Assert.Null(dest[1]);                     // null * 2 = null
+            Assert.Equal(1 * 2, (double)dest[2]!, Tolerance);
+        }
+
+        // ====================== 11. double * IReadOnlyCollection<T> (Span) ======================
+        [Fact]
+        public void Mul_Double_IReadOnlyCollectionT_Span()
+        {
+            Span<Length> dest = new Length[2];
+            scalarDouble.Mul<Length>((IReadOnlyCollection<Length>)unitsArray, dest);
+            Assert.Equal(2 * 1000, (double)dest[0], Tolerance);
+            Assert.Equal(2 * 1, (double)dest[1], Tolerance);
+        }
+
+        // ====================== 12. double * IReadOnlyCollection<T?> (Span) ======================
+        [Fact]
+        public void Mul_Double_IReadOnlyCollectionNullableT_Span()
+        {
+            Span<Length?> dest = new Length?[3];
+            scalarDouble.Mul<Length>((IReadOnlyCollection<Length?>)nullableUnitsArray, dest);
+            Assert.Equal(2 * 1000, (double)dest[0]!, Tolerance);
+            Assert.Null(dest[1]);                     // 2 * null = null
+            Assert.Equal(2 * 1, (double)dest[2]!, Tolerance);
+        }
+
+        // ====================== 13. IEnumerable<T> * double ======================
+        [Fact]
+        public void Mul_IEnumerableT_Double_Returns_IEnumerableT()
+        {
+            var result = ((IEnumerable<Length>)unitsArray).Mul<Length>(scalarDouble).ToList();
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 * 2, (double)result[0], Tolerance);
+            Assert.Equal(1 * 2, (double)result[1], Tolerance);
+        }
+
+        // ====================== 14. IEnumerable<T?> * double ======================
+        [Fact]
+        public void Mul_IEnumerableNullableT_Double_Returns_IEnumerableNullableT()
+        {
+            var result = ((IEnumerable<Length?>)nullableUnitsArray).Mul<Length>(scalarDouble).ToList();
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 * 2, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // null * 2 = null
+            Assert.Equal(1 * 2, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 15. double * IEnumerable<T> ======================
+        [Fact]
+        public void Mul_Double_IEnumerableT_Returns_IEnumerableT()
+        {
+            var result = scalarDouble.Mul<Length>((IEnumerable<Length>)unitsArray).ToList();
+            Assert.Equal(2, result.Count);
+            Assert.Equal(2 * 1000, (double)result[0], Tolerance);
+            Assert.Equal(2 * 1, (double)result[1], Tolerance);
+        }
+
+        // ====================== 16. double * IEnumerable<T?> ======================
+        [Fact]
+        public void Mul_Double_IEnumerableNullableT_Returns_IEnumerableNullableT()
+        {
+            var result = scalarDouble.Mul<Length>((IEnumerable<Length?>)nullableUnitsArray).ToList();
+            Assert.Equal(3, result.Count);
+            Assert.Equal(2 * 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // 2 * null = null
+            Assert.Equal(2 * 1, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 17. double[] * T ======================
+        [Fact]
+        public void Mul_DoubleArray_T_Returns_TArray()
+        {
+            var result = doubleArray.Mul(scalarUnit);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(5 * 1000, (double)result[0], Tolerance);
+            Assert.Equal(3 * 1000, (double)result[1], Tolerance);
+        }
+
+        // ====================== 18. double?[] * T ======================
+        [Fact]
+        public void Mul_NullableDoubleArray_T_Returns_NullableTArray()
+        {
+            var result = nullableDoubleArray.Mul(scalarUnit);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(5 * 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // null * Length = null
+            Assert.Equal(3 * 1000, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 19. T * double[] ======================
+        [Fact]
+        public void Mul_T_DoubleArray_Returns_TArray()
+        {
+            var result = scalarUnit.Mul(doubleArray);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 * 5, (double)result[0], Tolerance);
+            Assert.Equal(1000 * 3, (double)result[1], Tolerance);
+        }
+
+        // ====================== 20. T * double?[] ======================
+        [Fact]
+        public void Mul_T_NullableDoubleArray_Returns_NullableTArray()
+        {
+            var result = scalarUnit.Mul(nullableDoubleArray);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(1000 * 5, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // Length * null = null
+            Assert.Equal(1000 * 3, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 21. List<double> * T ======================
+        [Fact]
+        public void Mul_ListDouble_T_Returns_ListT()
+        {
+            var result = doubleList.Mul(scalarUnit);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(5 * 1000, (double)result[0], Tolerance);
+            Assert.Equal(3 * 1000, (double)result[1], Tolerance);
+        }
+
+        // ====================== 22. List<double?> * T ======================
+        [Fact]
+        public void Mul_ListNullableDouble_T_Returns_ListNullableT()
+        {
+            var result = nullableDoubleList.Mul(scalarUnit);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(5 * 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // null * Length = null
+            Assert.Equal(3 * 1000, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 23. T * List<double> ======================
+        [Fact]
+        public void Mul_T_ListDouble_Returns_ListT()
+        {
+            var result = scalarUnit.Mul(doubleList);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 * 5, (double)result[0], Tolerance);
+            Assert.Equal(1000 * 3, (double)result[1], Tolerance);
+        }
+
+        // ====================== 24. T * List<double?> ======================
+        [Fact]
+        public void Mul_T_ListNullableDouble_Returns_ListNullableT()
+        {
+            var result = scalarUnit.Mul(nullableDoubleList);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 * 5, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // Length * null = null
+            Assert.Equal(1000 * 3, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 25. T * T[] -> double[] ======================
+        [Fact]
+        public void Mul_T_TArray_Returns_DoubleArray()
+        {
+            var result = scalarUnit * unitsArray;
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 * 1000, result[0]._Value, Tolerance);
+            Assert.Equal(1000 * 1, result[1]._Value, Tolerance);
+        }
+
+        // Дополнительно: перегрузки с результатом double (без R)
+        [Fact]
+        public void Mul_TArray_T_Returns_DoubleArray()
+        {
+            var result = unitsArray * scalarUnit;
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 * 1000, result[0]._Value, Tolerance);
+            Assert.Equal(1 * 1000, result[1]._Value, Tolerance);
+        }
+
+        [Fact]
+        public void Mul_ListT_T_Returns_DoubleList()
+        {
+            var result = unitsList * scalarUnit;
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 * 1000, result[0]._Value, Tolerance);
+            Assert.Equal(1 * 1000, result[1]._Value, Tolerance);
+        }
+
+        // ====================== Обработка null коллекций ======================
+        [Fact]
+        public void Mul_NullArray_ReturnsNull()
+        {
+            Length[] nullArray = null!;
+            var result = nullArray.Mul<Length>(5.0);
+            Assert.Null(result);
+        }
+
+        [Fact]
+        public void Mul_NullList_ReturnsNull()
+        {
+            List<Length> nullList = null!;
+            var result = nullList.Mul<Length>(5.0);
+            Assert.Null(result);
+        }
+
+        [Fact]
+        public void Mul_EmptyArray_ReturnsEmptyArray()
+        {
+            var empty = Array.Empty<Length>();
+            var result = empty.Mul<Length>(5.0);
+            Assert.Empty(result);
+        }
+    }
+}

QWERTYkez.Mensura.Tests/CollectionsPlusExtensions.cs

@@ -0,0 +1,334 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using QWERTYkez.Mensura.Units;
+using QWERTYkez.Mensura.Extensions;
+using Xunit;
+
+namespace QWERTYkez.Mensura.Tests
+{
+    public class CollectionsPlusExtensionsTests
+    {
+        private const double Tolerance = 1e-12;
+        private static readonly Length scalarUnit = Length.Meter;            // 1000 mm
+        private static readonly double scalarDouble = 500.0;                 // прибавляемое значение в мм
+
+        // Коллекции единиц
+        private static readonly Length[] unitsArray = new[] { Length.Meter, Length._MilliMeter };
+        private static readonly Length?[] nullableUnitsArray = new Length?[] { Length.Meter, null, Length._MilliMeter };
+        private static readonly List<Length> unitsList = new List<Length> { Length.Meter, Length._MilliMeter };
+        private static readonly List<Length?> nullableUnitsList = new List<Length?> { Length.Meter, null, Length._MilliMeter };
+
+        // Коллекции double
+        private static readonly double[] doubleArray = new double[] { 200.0, 300.0 };
+        private static readonly double?[] nullableDoubleArray = new double?[] { 200.0, null, 300.0 };
+        private static readonly List<double> doubleList = new List<double> { 200.0, 300.0 };
+        private static readonly List<double?> nullableDoubleList = new List<double?> { 200.0, null, 300.0 };
+
+        // ====================== 1. T[] + double ======================
+        [Fact]
+        public void Plus_TArray_Double_Returns_TArray()
+        {
+            var result = unitsArray.Plus<Length>(scalarDouble);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 + 500, (double)result[0], Tolerance);
+            Assert.Equal(1 + 500, (double)result[1], Tolerance);
+        }
+
+        // ====================== 2. T?[] + double ======================
+        [Fact]
+        public void Plus_NullableTArray_Double_Returns_NullableTArray()
+        {
+            var result = nullableUnitsArray.Plus<Length>(scalarDouble);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(1000 + 500, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // null + число = null
+            Assert.Equal(1 + 500, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 3. double + T[] ======================
+        [Fact]
+        public void Plus_Double_TArray_Returns_TArray()
+        {
+            var result = scalarDouble.Plus<Length>(unitsArray);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(500 + 1000, (double)result[0], Tolerance);
+            Assert.Equal(500 + 1, (double)result[1], Tolerance);
+        }
+
+        // ====================== 4. double + T?[] ======================
+        [Fact]
+        public void Plus_Double_NullableTArray_Returns_NullableTArray()
+        {
+            var result = scalarDouble.Plus<Length>(nullableUnitsArray);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(500 + 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // число + null = null
+            Assert.Equal(500 + 1, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 5. List<T> + double ======================
+        [Fact]
+        public void Plus_ListT_Double_Returns_ListT()
+        {
+            var result = unitsList.Plus<Length>(scalarDouble);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 + 500, (double)result[0], Tolerance);
+            Assert.Equal(1 + 500, (double)result[1], Tolerance);
+        }
+
+        // ====================== 6. List<T?> + double ======================
+        [Fact]
+        public void Plus_ListNullableT_Double_Returns_ListNullableT()
+        {
+            var result = nullableUnitsList.Plus<Length>(scalarDouble);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 + 500, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // null + число = null
+            Assert.Equal(1 + 500, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 7. double + List<T> ======================
+        [Fact]
+        public void Plus_Double_ListT_Returns_ListT()
+        {
+            var result = scalarDouble.Plus<Length>(unitsList);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(500 + 1000, (double)result[0], Tolerance);
+            Assert.Equal(500 + 1, (double)result[1], Tolerance);
+        }
+
+        // ====================== 8. double + List<T?> ======================
+        [Fact]
+        public void Plus_Double_ListNullableT_Returns_ListNullableT()
+        {
+            var result = scalarDouble.Plus<Length>(nullableUnitsList);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(500 + 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // число + null = null
+            Assert.Equal(500 + 1, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 9. IReadOnlyCollection<T> + double (Span) ======================
+        [Fact]
+        public void Plus_IReadOnlyCollectionT_Double_Span()
+        {
+            Span<Length> dest = new Length[2];
+            ((IReadOnlyCollection<Length>)unitsArray).Plus<Length>(scalarDouble, dest);
+            Assert.Equal(1000 + 500, (double)dest[0], Tolerance);
+            Assert.Equal(1 + 500, (double)dest[1], Tolerance);
+        }
+
+        // ====================== 10. IReadOnlyCollection<T?> + double (Span) ======================
+        [Fact]
+        public void Plus_IReadOnlyCollectionNullableT_Double_Span()
+        {
+            Span<Length?> dest = new Length?[3];
+            ((IReadOnlyCollection<Length?>)nullableUnitsArray).Plus<Length>(scalarDouble, dest);
+            Assert.Equal(1000 + 500, (double)dest[0]!, Tolerance);
+            Assert.Null(dest[1]);                     // null + число = null
+            Assert.Equal(1 + 500, (double)dest[2]!, Tolerance);
+        }
+
+        // ====================== 11. double + IReadOnlyCollection<T> (Span) ======================
+        [Fact]
+        public void Plus_Double_IReadOnlyCollectionT_Span()
+        {
+            Span<Length> dest = new Length[2];
+            scalarDouble.Plus<Length>((IReadOnlyCollection<Length>)unitsArray, dest);
+            Assert.Equal(500 + 1000, (double)dest[0], Tolerance);
+            Assert.Equal(500 + 1, (double)dest[1], Tolerance);
+        }
+
+        // ====================== 12. double + IReadOnlyCollection<T?> (Span) ======================
+        [Fact]
+        public void Plus_Double_IReadOnlyCollectionNullableT_Span()
+        {
+            Span<Length?> dest = new Length?[3];
+            scalarDouble.Plus<Length>((IReadOnlyCollection<Length?>)nullableUnitsArray, dest);
+            Assert.Equal(500 + 1000, (double)dest[0]!, Tolerance);
+            Assert.Null(dest[1]);                     // число + null = null
+            Assert.Equal(500 + 1, (double)dest[2]!, Tolerance);
+        }
+
+        // ====================== 13. IEnumerable<T> + double ======================
+        [Fact]
+        public void Plus_IEnumerableT_Double_Returns_IEnumerableT()
+        {
+            var result = ((IEnumerable<Length>)unitsArray).Plus<Length>(scalarDouble).ToList();
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 + 500, (double)result[0], Tolerance);
+            Assert.Equal(1 + 500, (double)result[1], Tolerance);
+        }
+
+        // ====================== 14. IEnumerable<T?> + double ======================
+        [Fact]
+        public void Plus_IEnumerableNullableT_Double_Returns_IEnumerableNullableT()
+        {
+            var result = ((IEnumerable<Length?>)nullableUnitsArray).Plus<Length>(scalarDouble).ToList();
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 + 500, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // null + число = null
+            Assert.Equal(1 + 500, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 15. double + IEnumerable<T> ======================
+        [Fact]
+        public void Plus_Double_IEnumerableT_Returns_IEnumerableT()
+        {
+            var result = scalarDouble.Plus<Length>((IEnumerable<Length>)unitsArray).ToList();
+            Assert.Equal(2, result.Count);
+            Assert.Equal(500 + 1000, (double)result[0], Tolerance);
+            Assert.Equal(500 + 1, (double)result[1], Tolerance);
+        }
+
+        // ====================== 16. double + IEnumerable<T?> ======================
+        [Fact]
+        public void Plus_Double_IEnumerableNullableT_Returns_IEnumerableNullableT()
+        {
+            var result = scalarDouble.Plus<Length>((IEnumerable<Length?>)nullableUnitsArray).ToList();
+            Assert.Equal(3, result.Count);
+            Assert.Equal(500 + 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // число + null = null
+            Assert.Equal(500 + 1, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 17. double[] + T ======================
+        [Fact]
+        public void Plus_DoubleArray_T_Returns_TArray()
+        {
+            var result = doubleArray.Plus(scalarUnit);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(200 + 1000, (double)result[0], Tolerance);
+            Assert.Equal(300 + 1000, (double)result[1], Tolerance);
+        }
+
+        // ====================== 18. double?[] + T ======================
+        [Fact]
+        public void Plus_NullableDoubleArray_T_Returns_NullableTArray()
+        {
+            var result = nullableDoubleArray.Plus(scalarUnit);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(200 + 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // null + Length = null
+            Assert.Equal(300 + 1000, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 19. T + double[] ======================
+        [Fact]
+        public void Plus_T_DoubleArray_Returns_TArray()
+        {
+            var result = scalarUnit.Plus(doubleArray);
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 + 200, (double)result[0], Tolerance);
+            Assert.Equal(1000 + 300, (double)result[1], Tolerance);
+        }
+
+        // ====================== 20. T + double?[] ======================
+        [Fact]
+        public void Plus_T_NullableDoubleArray_Returns_NullableTArray()
+        {
+            var result = scalarUnit.Plus(nullableDoubleArray);
+            Assert.Equal(3, result.Length);
+            Assert.Equal(1000 + 200, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // Length + null = null
+            Assert.Equal(1000 + 300, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 21. List<double> + T ======================
+        [Fact]
+        public void Plus_ListDouble_T_Returns_ListT()
+        {
+            var result = doubleList.Plus(scalarUnit);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(200 + 1000, (double)result[0], Tolerance);
+            Assert.Equal(300 + 1000, (double)result[1], Tolerance);
+        }
+
+        // ====================== 22. List<double?> + T ======================
+        [Fact]
+        public void Plus_ListNullableDouble_T_Returns_ListNullableT()
+        {
+            var result = nullableDoubleList.Plus(scalarUnit);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(200 + 1000, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // null + Length = null
+            Assert.Equal(300 + 1000, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 23. T + List<double> ======================
+        [Fact]
+        public void Plus_T_ListDouble_Returns_ListT()
+        {
+            var result = scalarUnit.Plus(doubleList);
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 + 200, (double)result[0], Tolerance);
+            Assert.Equal(1000 + 300, (double)result[1], Tolerance);
+        }
+
+        // ====================== 24. T + List<double?> ======================
+        [Fact]
+        public void Plus_T_ListNullableDouble_Returns_ListNullableT()
+        {
+            var result = scalarUnit.Plus(nullableDoubleList);
+            Assert.Equal(3, result.Count);
+            Assert.Equal(1000 + 200, (double)result[0]!, Tolerance);
+            Assert.Null(result[1]);                     // Length + null = null
+            Assert.Equal(1000 + 300, (double)result[2]!, Tolerance);
+        }
+
+        // ====================== 25. T + T[] -> double[] ======================
+        [Fact]
+        public void Plus_T_TArray_Returns_DoubleArray()
+        {
+            var result = scalarUnit + unitsArray;
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 + 1000, result[0]._Value, Tolerance);
+            Assert.Equal(1000 + 1, result[1]._Value, Tolerance);
+        }
+
+        // Дополнительно: перегрузки с результатом double (без R)
+        [Fact]
+        public void Plus_TArray_T_Returns_DoubleArray()
+        {
+            var result = unitsArray + scalarUnit;
+            Assert.Equal(2, result.Length);
+            Assert.Equal(1000 + 1000, result[0]._Value, Tolerance);
+            Assert.Equal(1 + 1000, result[1]._Value, Tolerance);
+        }
+
+        [Fact]
+        public void Plus_ListT_T_Returns_DoubleList()
+        {
+            var result = unitsList + scalarUnit;
+            Assert.Equal(2, result.Count);
+            Assert.Equal(1000 + 1000, result[0]._Value, Tolerance);
+            Assert.Equal(1 + 1000, result[1]._Value, Tolerance);
+        }
+
+        // ====================== Обработка null коллекций ======================
+        [Fact]
+        public void Plus_NullArray_ReturnsNull()
+        {
+            Length[] nullArray = null;
+            var result = nullArray.Plus<Length>(5.0);
+            Assert.Null(result);
+        }
+
+        [Fact]
+        public void Plus_NullList_ReturnsNull()
+        {
+            List<Length> nullList = null;
+            var result = nullList.Plus<Length>(5.0);
+            Assert.Null(result);
+        }
+
+        [Fact]
+        public void Plus_EmptyArray_ReturnsEmptyArray()
+        {
+            var empty = Array.Empty<Length>();
+            var result = empty.Plus<Length>(5.0);
+            Assert.Empty(result);
+        }
+    }
+}

QWERTYkez.Mensura.Tests/CollectionsPow2Extensions.cs

@@ -0,0 +1,73 @@
+namespace QWERTYkez.Mensura.Tests;
+
+public class CollectionsPow2Extensions
+{
+    [Fact]
+    public void Pow2_Array_CalculatesCorrectly()
+    {
+        // Arrange
+        Length[] source = [new(2), new(3), new(10)];
+
+        // Act
+        Length[] result = source.Pow2<Length, Length>();
+
+        // Assert
+        Assert.Equal(4, result[0]._Value);
+        Assert.Equal(9, result[1]._Value);
+        Assert.Equal(100, result[2]._Value);
+    }
+
+    [Fact]
+    public void Pow2_NullableArray_HandlesNulls()
+    {
+        // Arrange
+        Length?[] source = [new(5), null, new(4)];
+
+        // Act
+        Length?[] result = source.Pow2<Length, Length>();
+
+        // Assert
+        Assert.Equal(25, result[0]?._Value);
+        Assert.Null(result[1]);
+        Assert.Equal(16, result[2]?._Value);
+    }
+
+    [Fact]
+    public void Pow2_List_ReturnsCorrectResult()
+    {
+        // Arrange
+        var source = new List<Length> { new(2), new(8) };
+
+        // Act
+        var result = source.Pow2<Length, Length>();
+
+        // Assert
+        Assert.Equal(4, result[0]._Value);
+        Assert.Equal(64, result[1]._Value);
+    }
+
+    [Fact]
+    public void Pow2_IEnumerable_ProcessesCorrectly()
+    {
+        // Arrange
+        IEnumerable<Length> source = new HashSet<Length> { new(3), new(7) };
+
+        // Act
+        var result = source.Pow2<Length, Length>().ToList();
+
+        // Assert
+        Assert.Contains(result, x => x._Value == 9);
+        Assert.Contains(result, x => x._Value == 49);
+    }
+
+    [Fact]
+    public void Pow2_DestinationTooShort_ThrowsArgumentException()
+    {
+        // Arrange
+        Length[] source = [new(2), new(3)];
+        Length[] dest = new Length[1];
+
+        // Act & Assert
+        Assert.Throws<ArgumentException>(() => source.Pow2(dest));
+    }
+}

QWERTYkez.Mensura.Tests/CollectionsPow3Extensions.cs

@@ -0,0 +1,59 @@
+namespace QWERTYkez.Mensura.Tests;
+
+public class Pow3ExtensionsTests
+{
+    [Fact]
+    public void Pow3_Array_CalculatesCorrectly()
+    {
+        // Arrange: 2^3=8, 3^3=27, 4^3=64
+        Length[] source = [new(2), new(3), new(4)];
+
+        // Act
+        Length[] result = source.Pow3<Length, Length>();
+
+        // Assert
+        Assert.Equal(8, result[0]._Value);
+        Assert.Equal(27, result[1]._Value);
+        Assert.Equal(64, result[2]._Value);
+    }
+
+    [Fact]
+    public void Pow3_NullableArray_HandlesNulls()
+    {
+        // Arrange
+        Length?[] source = [new(5), null, new(10)];
+
+        // Act
+        Length?[] result = source.Pow3<Length, Length>();
+
+        // Assert
+        Assert.Equal(125, result[0]?._Value);
+        Assert.Null(result[1]);
+        Assert.Equal(1000, result[2]?._Value);
+    }
+
+    [Fact]
+    public void Pow3_List_ReturnsCorrectResult()
+    {
+        // Arrange
+        var source = new List<Length> { new(2), new(5) };
+
+        // Act
+        var result = source.Pow3<Length, Length>();
+
+        // Assert
+        Assert.Equal(8, result[0]._Value);
+        Assert.Equal(125, result[1]._Value);
+    }
+
+    [Fact]
+    public void Pow3_DestinationTooShort_ThrowsArgumentException()
+    {
+        // Arrange
+        Length[] source = [new(2), new(3)];
+        Length[] dest = new Length[1];
+
+        // Act & Assert
+        Assert.Throws<ArgumentException>(() => source.Pow3(dest));
+    }
+}

QWERTYkez.Mensura.Tests/CollectionsPowNExtensions.cs

@@ -0,0 +1,75 @@
+namespace QWERTYkez.Mensura.Tests;
+
+public class CollectionsPowNExtensions
+{
+    private const double BaseVal = 3.0;
+    private const double Expected = 9.0; // 3^2 = 9
+
+    [Fact]
+    public void Test_PowN()
+    {
+        Length[] arr = [new(BaseVal)];
+        Length?[] arrNull = [new(BaseVal), null];
+        List<Length> list = [new(BaseVal)];
+        List<Length?> listNull = [new(BaseVal), null];
+        IReadOnlyCollection<Length> roc = list;
+        IEnumerable<Length> en = list;
+        IEnumerable<Length?> enNull = listNull;
+
+        // --- 1. Целые степени (int) ---
+        // Span-based Core
+        Span<Length> dstSpan = new Length[1];
+        arr.AsSpan().PowCore(2, 1, dstSpan);
+        Assert.Equal(Expected, dstSpan[0]._Value);
+
+        arrNull.AsSpan().PowCore(2, 2, new Length?[2]); // Проверка nullable span
+
+        arr.AsSpan().Pow(2, dstSpan);
+        Assert.Equal(Expected, dstSpan[0]._Value);
+
+        // Arrays
+        Assert.Equal(Expected, arr.Pow<Length, Length>(2)[0]._Value);
+        Assert.Equal(Expected, arrNull.Pow<Length, Length>(2)[0]?._Value);
+
+        // Lists
+        Assert.Equal(Expected, list.Pow<Length, Length>(2)[0]._Value);
+        Assert.Equal(Expected, listNull.Pow<Length, Length>(2)[0]?._Value);
+
+        // ReadOnlyCollection
+        roc.Pow(2, dstSpan);
+        Assert.Equal(Expected, dstSpan[0]._Value);
+
+        // IEnumerable / Iterators
+        Assert.Equal(Expected, en.Pow<Length, Length>(2).First()._Value);
+        Assert.Equal(Expected, enNull.Pow<Length, Length>(2).First(x => x.HasValue)?._Value);
+
+
+        // --- 2. Дробные степени (double) ---
+        // Span-based Core
+        arr.AsSpan().PowCore(2.0, 1, dstSpan);
+        Assert.Equal(Expected, dstSpan[0]._Value);
+
+        arr.AsSpan().Pow(2.0, dstSpan);
+        Assert.Equal(Expected, dstSpan[0]._Value);
+
+        // Arrays
+        Assert.Equal(Expected, arr.Pow<Length, Length>(2.0)[0]._Value);
+        Assert.Equal(Expected, arrNull.Pow<Length, Length>(2.0)[0]?._Value);
+
+        // Lists
+        Assert.Equal(Expected, list.Pow<Length, Length>(2.0)[0]._Value);
+        Assert.Equal(Expected, listNull.Pow<Length, Length>(2.0)[0]?._Value);
+
+        // ReadOnlyCollection
+        roc.Pow(2.0, dstSpan);
+        Assert.Equal(Expected, dstSpan[0]._Value);
+
+        // IEnumerable / Iterators
+        Assert.Equal(Expected, en.Pow<Length, Length>(2.0).First()._Value);
+        Assert.Equal(Expected, enNull.Pow<Length, Length>(2.0).First(x => x.HasValue)?._Value);
+
+        // Дополнительные итераторы
+        Assert.Equal(Expected, en.PowIterator<Length, Length>(2.0).First()._Value);
+        Assert.Equal(Expected, enNull.PowNullableIterator<Length, Length>(2.0).First(x => x.HasValue)?._Value);
+    }
+}

QWERTYkez.Mensura.Tests/CollectionsRootOfCubeExtensions.cs

@@ -0,0 +1,59 @@
+namespace QWERTYkez.Mensura.Tests;
+
+public class CollectionsRootOfCubeExtensions
+{
+    [Fact]
+    public void Cbrt_Array_CalculatesCorrectly()
+    {
+        Length[] source = [new(4), new(9), new(16), new(25)];
+        // Ожидаем корень, но важно: Math.Sqrt(4) = 2. 
+        // Если ваш код делает специфичные преобразования, адаптируйте Assert.
+        var result = source.Cbrt<Length, Length>();
+
+        Assert.Equal(2, result[0]._Value);
+        Assert.Equal(3, result[1]._Value);
+        Assert.Equal(4, result[2]._Value);
+        Assert.Equal(5, result[3]._Value);
+    }
+
+    [Fact]
+    public void Cbrt_NullableArray_HandlesNulls()
+    {
+        Length?[] source = [new(16), null, new(36)];
+        var result = source.Cbrt<Length, Length>();
+
+        Assert.Equal(4, result[0]?._Value);
+        Assert.Null(result[1]);
+        Assert.Equal(6, result[2]?._Value);
+    }
+
+    [Fact]
+    public void Cbrt_DestinationTooShort_ThrowsArgumentException()
+    {
+        Length[] source = [new(1), new(4)];
+        Length[] dest = new Length[1];
+
+        Assert.Throws<ArgumentException>(() => source.Cbrt(dest));
+    }
+
+    [Fact]
+    public void Cbrt_List_WorksCorrectly()
+    {
+        var list = new List<Length> { new(1), new(4) };
+        var result = list.Cbrt<Length, Length>();
+
+        Assert.Equal(2, result.Count);
+        Assert.Equal(1, result[0]._Value);
+        Assert.Equal(2, result[1]._Value);
+    }
+
+    [Fact]
+    public void Cbrt_IEnumerable_NoExtraAllocations()
+    {
+        IEnumerable<Length> source = new HashSet<Length> { new(9), new(81) };
+        var result = source.Cbrt<Length, Length>().ToList();
+
+        Assert.Contains(result, x => x._Value == 3);
+        Assert.Contains(result, x => x._Value == 9);
+    }
+}

QWERTYkez.Mensura.Tests/CollectionsRootOfSquareExtensions.cs

@@ -0,0 +1,75 @@
+namespace QWERTYkez.Mensura.Tests;
+
+public class CollectionsRootOfSquareExtensions
+{
+    [Fact]
+    public void Sqrt_Array_ShouldCalculateCorrectly()
+    {
+        // Arrange
+        Length[] source = [new(4), new(9), new(16)];
+
+        // Act
+        Length[] result = source.Sqrt<Length, Length>();
+
+        // Assert
+        Assert.Equal(2, result[0]._Value);
+        Assert.Equal(3, result[1]._Value);
+        Assert.Equal(4, result[2]._Value);
+    }
+
+    [Fact]
+    public void Sqrt_NullableArray_ShouldHandleNulls()
+    {
+        // Arrange
+        Length?[] source = [new(25), null, new(100)];
+
+        // Act
+        Length?[] result = source.Sqrt<Length, Length>();
+
+        // Assert
+        Assert.Equal(5, result[0]?._Value);
+        Assert.Null(result[1]);
+        Assert.Equal(10, result[2]?._Value);
+    }
+
+    [Fact]
+    public void Sqrt_List_ShouldReturnCorrectList()
+    {
+        // Arrange
+        var source = new List<Length> { new(1), new(4), new(9) };
+
+        // Act
+        var result = source.Sqrt<Length, Length>();
+
+        // Assert
+        Assert.Equal(3, result.Count);
+        Assert.Equal(1, result[0]._Value);
+        Assert.Equal(2, result[1]._Value);
+        Assert.Equal(3, result[2]._Value);
+    }
+
+    [Fact]
+    public void Sqrt_DestinationTooShort_ShouldThrowArgumentException()
+    {
+        // Arrange
+        Length[] source = [new(4), new(9)];
+        Length[] dest = new Length[1]; // Слишком мало
+
+        // Act & Assert
+        Assert.Throws<ArgumentException>(() => source.AsSpan().Sqrt(dest.AsSpan()));
+    }
+
+    [Fact]
+    public void Sqrt_IEnumerable_ShouldWorkWithGenericCollection()
+    {
+        // Arrange
+        IEnumerable<Length> source = new HashSet<Length> { new(16), new(64) };
+
+        // Act
+        var result = source.Sqrt<Length, Length>().ToList();
+
+        // Assert
+        Assert.Contains(result, x => x._Value == 4);
+        Assert.Contains(result, x => x._Value == 8);
+    }
+}

QWERTYkez.Mensura.Tests/DoubleExtensions.cs

@@ -0,0 +1,164 @@
+namespace QWERTYkez.Mensura.Tests;
+
+public class DoubleExtensions
+{
+    #region 1. Тесты скалярных типов (Обычные, Экзотические и Nullable)
+
+    [Fact]
+    public void ToDouble_Should_Convert_ExoticTypes_Without_InvalidCastException()
+    {
+        // Проверяем типы, которые раньше могли падать в рантайме из-за Convert.ToDouble(object)
+        Half halfValue = (Half)3.14f;
+        Int128 int128Value = Int128.Parse("1234567890123456789012345");
+        UInt128 uInt128Value = UInt128.Parse("9876543210987654321098765");
+        nint nintValue = 42;
+
+        // Act & Assert
+        Assert.Equal(3.14, halfValue.ToDouble(), 2);
+        Assert.Equal((double)int128Value, int128Value.ToDouble());
+        Assert.Equal((double)uInt128Value, uInt128Value.ToDouble());
+        Assert.Equal(42.0, nintValue.ToDouble());
+    }
+
+    [Theory]
+    [InlineData((int)100, 100.0)]
+    [InlineData((byte)5, 5.0)]
+    [InlineData((float)1.5f, 1.5)]
+    public void ToDouble_StandardScalars_ShouldConvertCorrectly(object input, double expected)
+    {
+        double result = input switch
+        {
+            int i => i.ToDouble(),
+            byte b => b.ToDouble(),
+            float f => f.ToDouble(),
+            _ => throw new ArgumentException("Unsupported type in test")
+        };
+
+        Assert.Equal(expected, result);
+    }
+
+    [Fact]
+    public void ToDouble_NullableScalars_Should_Return_Zero_When_Null()
+    {
+        // Arrange
+        int? nullInt = null;
+        Half? nullHalf = null;
+        Int128? nullInt128 = null;
+
+        int? validInt = 10;
+        Half? validHalf = (Half)2.5f;
+
+        // Act & Assert
+        Assert.Equal(0d, nullInt.ToDouble());
+        Assert.Equal(0d, nullHalf.ToDouble());
+        Assert.Equal(0d, nullInt128.ToDouble());
+
+        Assert.Equal(10d, validInt.ToDouble());
+        Assert.Equal(2.5d, validHalf.ToDouble(), 1);
+    }
+    #endregion
+
+    #region 2. Тесты SIMD и оптимизаций коллекций (Различные длины массивов)
+
+    [Theory]
+    [InlineData(0)]   // Пустой массив
+    [InlineData(1)]   // 1 элемент (чисто скалярный fallback)
+    [InlineData(7)]   // Нечетное число элементов
+    [InlineData(16)]  // Кратный размер (размер Vector128/Vector256)
+    [InlineData(35)]  // Большой массив с остатком для скалярного хвоста
+    public void ToDouble_ArrayAndList_Should_Correctly_Map_Via_SIMD_Or_Fallback(int count)
+    {
+        // Arrange
+        float[] sourceArray = [.. Enumerable.Range(1, count).Select(x => x * 1.5f)];
+        List<float> sourceList = [.. sourceArray];
+
+        double[] destFromArray = new double[count];
+        double[] destFromList = new double[count];
+
+        // Act
+        // Явное приведение к IReadOnlyCollection устраняет ошибку CS0121 (неоднозначность вызова)
+        ((IReadOnlyCollection<float>)sourceArray).ToDouble(destFromArray);
+        ((IReadOnlyCollection<float>)sourceList).ToDouble(destFromList);
+
+        // Assert
+        for (int i = 0; i < count; i++)
+        {
+            double expected = sourceArray[i];
+            Assert.Equal(expected, destFromArray[i]);
+            Assert.Equal(expected, destFromList[i]);
+        }
+    }
+    #endregion
+
+    #region 3. Тесты Nullable-коллекций (Проверка на null-элементы внутри)
+
+    [Fact]
+    public void ToDouble_Nullable_Collections_Should_Keep_Nulls_In_Destination()
+    {
+        // Arrange
+        UInt128?[] sourceArray = [10, null, 20, null, 30];
+        double?[] destination = new double?[sourceArray.Length];
+
+        // Act
+        ((IReadOnlyCollection<UInt128?>)sourceArray).ToDouble(destination);
+
+        // Assert
+        Assert.Equal(10d, destination[0]);
+        Assert.Null(destination[1]);
+        Assert.Equal(20d, destination[2]);
+        Assert.Null(destination[3]);
+        Assert.Equal(30d, destination[4]);
+    }
+    #endregion
+
+    #region 4. Тесты LINQ / Отложенного выполнения (IEnumerable)
+
+    [Fact]
+    public void ToDouble_IEnumerable_Extension_Should_Handle_Execution_Types_Correctly()
+    {
+        // Arrange
+        int[] array = [1, 2, 3];
+        List<int> list = [4, 5, 6];
+        IEnumerable<int> genericEnum = Enumerable.Range(7, 3);
+
+        // Act
+        var resFromArray = array.ToDouble(); // Быстрый бранч для массива
+        var resFromList = list.ToDouble();   // Быстрый бранч для списка
+        var resFromEnum = genericEnum.ToDouble(); // Медленный итератор по IEnumerable
+
+        // Assert
+        Assert.Equal([1d, 2d, 3d], resFromArray);
+        Assert.Equal([4d, 5d, 6d], resFromList);
+        Assert.Equal([7d, 8d, 9d], resFromEnum);
+    }
+    #endregion
+
+    #region 5. Тесты безопасности и валидации аргументов
+
+    [Fact]
+    public void ToDouble_Should_Throw_ArgumentException_When_Destination_Is_Too_Short()
+    {
+        // Arrange
+        int[] source = [1, 2, 3, 4, 5];
+        double[] destinationTooShort = new double[4]; // Нужен размер >= 5
+
+        // Act & Assert
+        Assert.Throws<ArgumentException>(() => ((IReadOnlyCollection<int>)source).ToDouble(destinationTooShort));
+    }
+
+    [Fact]
+    public void ToDouble_Should_Do_Nothing_And_Return_When_Collection_Is_Empty_Or_Null()
+    {
+        // Arrange
+        int[]? nullArray = null;
+        int[] emptyArray = [];
+        double[] destination = new double[5];
+
+        // Act & Assert (Не должно выбрасывать NullReferenceException или ArgumentException)
+        ((IReadOnlyCollection<int>?)nullArray)!.ToDouble(destination);
+        ((IReadOnlyCollection<int>)emptyArray).ToDouble(destination);
+
+        Assert.All(destination, x => Assert.Equal(0d, x)); // Назначение осталось нетронутым (все нули по умолчанию)
+    }
+    #endregion
+}

QWERTYkez.Mensura.Tests/QWERTYkez.Mensura.Tests.csproj

@@ -7,6 +7,14 @@
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net10.0|AnyCPU'">
+    <NoWarn>1701;1702;IDE0221</NoWarn>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net10.0|AnyCPU'">
+    <NoWarn>1701;1702;IDE0221</NoWarn>
+  </PropertyGroup>
+
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="10.0.1">
       <PrivateAssets>all</PrivateAssets>
@@ -23,6 +31,8 @@
 
   <ItemGroup>
     <ProjectReference Include="..\QWERTYkez.Mensura\QWERTYkez.Mensura.csproj" />
+	<InternalsVisibleTo Include="..\QWERTYkez.Mensura\QWERTYkez.Mensura.csproj" />
+	  
     <ProjectReference Include="..\QWERTYkez.Mensura.Generator\QWERTYkez.Mensura.Generator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
   </ItemGroup>
 

QWERTYkez.Mensura.Tests/globals.cs

@@ -0,0 +1,2 @@
+global using QWERTYkez.Mensura.Extensions;
+global using QWERTYkez.Mensura.Units;

QWERTYkez.Mensura/Extensions/AggregateUnitExtensions.cs

@@ -296,80 +296,6 @@ internal static partial class AggregateUnitExtensions
         return CollectionsMarshal.AsSpan(list).Min();
     }
 
-    // === ICollection<T> ===
-    internal static T Sum<T>(this ICollection<T> collection)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (collection == null || collection.Count == 0) return default;
-        if (collection is T[] array) return array.Sum();
-        if (collection is List<T> list) return list.Sum();
-
-        T[] sharedArray = ArrayPool<T>.Shared.Rent(collection.Count);
-        try
-        {
-            collection.CopyTo(sharedArray, 0); // Встроенный CopyTo работает быстрее, чем ручной foreach
-            return new ReadOnlySpan<T>(sharedArray, 0, collection.Count).Sum();
-        }
-        finally
-        {
-            ArrayPool<T>.Shared.Return(sharedArray);
-        }
-    }
-    internal static T Avg<T>(this ICollection<T> collection)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (collection == null || collection.Count == 0) return double.NaN.ToUnit<T>();
-        if (collection is T[] array) return array.Avg();
-        if (collection is List<T> list) return list.Avg();
-
-        T[] sharedArray = ArrayPool<T>.Shared.Rent(collection.Count);
-        try
-        {
-            collection.CopyTo(sharedArray, 0);
-            return new ReadOnlySpan<T>(sharedArray, 0, collection.Count).Avg();
-        }
-        finally
-        {
-            ArrayPool<T>.Shared.Return(sharedArray);
-        }
-    }
-    internal static T Max<T>(this ICollection<T> collection)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (collection == null || collection.Count == 0) return double.MinValue.ToUnit<T>();
-        if (collection is T[] array) return array.Max();
-        if (collection is List<T> list) return list.Max();
-
-        T[] sharedArray = ArrayPool<T>.Shared.Rent(collection.Count);
-        try
-        {
-            collection.CopyTo(sharedArray, 0);
-            return new ReadOnlySpan<T>(sharedArray, 0, collection.Count).Max();
-        }
-        finally
-        {
-            ArrayPool<T>.Shared.Return(sharedArray);
-        }
-    }
-    internal static T Min<T>(this ICollection<T> collection)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (collection == null || collection.Count == 0) return double.MaxValue.ToUnit<T>();
-        if (collection is T[] array) return array.Min();
-        if (collection is List<T> list) return list.Min();
-
-        T[] sharedArray = ArrayPool<T>.Shared.Rent(collection.Count);
-        try
-        {
-            collection.CopyTo(sharedArray, 0);
-            return new ReadOnlySpan<T>(sharedArray, 0, collection.Count).Min();
-        }
-        finally
-        {
-            ArrayPool<T>.Shared.Return(sharedArray);
-        }
-    }
-
     // === IReadOnlyCollection<T> ===
     internal static T Sum<T>(this IReadOnlyCollection<T> collection)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -446,7 +372,6 @@ internal static partial class AggregateUnitExtensions
         // Быстрый SIMD-путь для готовых коллекций (0 аллокаций)
         if (collection is T[] array) return array.Sum();
         if (collection is List<T> list) return list.Sum();
-        if (collection is ICollection<T> col) return col.Sum();
         if (collection is IReadOnlyCollection<T> roc) return roc.Sum();
 
         // Медленный путь для yield return: считаем на лету без буферов
@@ -468,7 +393,6 @@ internal static partial class AggregateUnitExtensions
 
         if (collection is T[] array) return array.Avg();
         if (collection is List<T> list) return list.Avg();
-        if (collection is ICollection<T> col) return col.Avg();
         if (collection is IReadOnlyCollection<T> roc) return roc.Avg();
 
         double sum = 0;
@@ -492,7 +416,6 @@ internal static partial class AggregateUnitExtensions
 
         if (collection is T[] array) return array.Max();
         if (collection is List<T> list) return list.Max();
-        if (collection is ICollection<T> col) return col.Max();
         if (collection is IReadOnlyCollection<T> roc) return roc.Max();
 
         double max = double.MinValue;
@@ -514,7 +437,6 @@ internal static partial class AggregateUnitExtensions
 
         if (collection is T[] array) return array.Min();
         if (collection is List<T> list) return list.Min();
-        if (collection is ICollection<T> col) return col.Min();
         if (collection is IReadOnlyCollection<T> roc) return roc.Min();
 
         double min = double.MaxValue;
@@ -708,80 +630,6 @@ internal static partial class AggregateUnitExtensions
         return CollectionsMarshal.AsSpan(list).Min();
     }
 
-    // === ICollection<T> ===
-    internal static T Sum<T>(this ICollection<T?> collection)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (collection == null || collection.Count == 0) return default;
-        if (collection is T?[] array) return array.Sum();
-        if (collection is List<T?> list) return list.Sum();
-
-        T?[] sharedArray = ArrayPool<T?>.Shared.Rent(collection.Count);
-        try
-        {
-            collection.CopyTo(sharedArray, 0);
-            return new ReadOnlySpan<T?>(sharedArray, 0, collection.Count).Sum();
-        }
-        finally
-        {
-            ArrayPool<T?>.Shared.Return(sharedArray);
-        }
-    }
-    internal static T Avg<T>(this ICollection<T?> collection)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (collection == null || collection.Count == 0) return double.NaN.ToUnit<T>();
-        if (collection is T?[] array) return array.Avg();
-        if (collection is List<T?> list) return list.Avg();
-
-        T?[] sharedArray = ArrayPool<T?>.Shared.Rent(collection.Count);
-        try
-        {
-            collection.CopyTo(sharedArray, 0);
-            return new ReadOnlySpan<T?>(sharedArray, 0, collection.Count).Avg();
-        }
-        finally
-        {
-            ArrayPool<T?>.Shared.Return(sharedArray);
-        }
-    }
-    internal static T Max<T>(this ICollection<T?> collection)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (collection == null || collection.Count == 0) return double.MinValue.ToUnit<T>();
-        if (collection is T?[] array) return array.Max();
-        if (collection is List<T?> list) return list.Max();
-
-        T?[] sharedArray = ArrayPool<T?>.Shared.Rent(collection.Count);
-        try
-        {
-            collection.CopyTo(sharedArray, 0);
-            return new ReadOnlySpan<T?>(sharedArray, 0, collection.Count).Max();
-        }
-        finally
-        {
-            ArrayPool<T?>.Shared.Return(sharedArray);
-        }
-    }
-    internal static T Min<T>(this ICollection<T?> collection)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (collection == null || collection.Count == 0) return double.MaxValue.ToUnit<T>();
-        if (collection is T?[] array) return array.Min();
-        if (collection is List<T?> list) return list.Min();
-
-        T?[] sharedArray = ArrayPool<T?>.Shared.Rent(collection.Count);
-        try
-        {
-            collection.CopyTo(sharedArray, 0);
-            return new ReadOnlySpan<T?>(sharedArray, 0, collection.Count).Min();
-        }
-        finally
-        {
-            ArrayPool<T?>.Shared.Return(sharedArray);
-        }
-    }
-
     // === IReadOnlyCollection<T> ===
     internal static T Sum<T>(this IReadOnlyCollection<T?> collection)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -857,7 +705,6 @@ internal static partial class AggregateUnitExtensions
         // Быстрый SIMD-путь для готовых коллекций за 0 аллокаций
         if (collection is T?[] array) return array.Sum();
         if (collection is List<T?> list) return list.Sum();
-        if (collection is ICollection<T?> col) return col.Sum();
         if (collection is IReadOnlyCollection<T?> roc) return roc.Sum();
 
         // Медленный путь для ленивого yield return: вычисляем на лету
@@ -882,7 +729,6 @@ internal static partial class AggregateUnitExtensions
 
         if (collection is T?[] array) return array.Avg();
         if (collection is List<T?> list) return list.Avg();
-        if (collection is ICollection<T?> col) return col.Avg();
         if (collection is IReadOnlyCollection<T?> roc) return roc.Avg();
 
         double sum = 0;
@@ -909,7 +755,6 @@ internal static partial class AggregateUnitExtensions
 
         if (collection is T?[] array) return array.Max();
         if (collection is List<T?> list) return list.Max();
-        if (collection is ICollection<T?> col) return col.Max();
         if (collection is IReadOnlyCollection<T?> roc) return roc.Max();
 
         double max = double.MinValue;
@@ -934,7 +779,6 @@ internal static partial class AggregateUnitExtensions
 
         if (collection is T?[] array) return array.Min();
         if (collection is List<T?> list) return list.Min();
-        if (collection is ICollection<T?> col) return col.Min();
         if (collection is IReadOnlyCollection<T?> roc) return roc.Min();
 
         double min = double.MaxValue;

QWERTYkez.Mensura/Extensions/CastExtensions.cs

@@ -1,51 +1,35 @@
-namespace QWERTYkez.Mensura.Extensions;
+using System.Reflection;
+using System.Reflection.Emit;
+
+namespace QWERTYkez.Mensura.Extensions;
 
 internal static partial class CastExtensions
 {
-
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static double ToDouble<T>(this T unit)
+    internal static double ToDouble<T>(this T unit) where T : struct, IMensuraUnit, IEquatable<T>
-        where T : struct, IMensuraUnit, IEquatable<T>
+        => Unsafe.As<T, double>(ref unit);
-    {
-        return Unsafe.As<T, double>(ref unit);
-    }
-
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static T ToUnit<T>(this double val)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        return Unsafe.As<double, T>(ref val);
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void SetCountUnsafe<T>(this List<T> list, int count)
-    {
-        // Берем адрес управляемого объекта List в памяти
-        // Объект передается по ref-ссылке, преобразуется в указатель
-        ref var mimic = ref Unsafe.As<List<T>, Mimics<T>>(ref list);
-
-        // Меняем приватный размер напрямую в памяти объекта!
-        mimic.Size = count;
-    }
-
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] internal static T ToUnit<T>(this double val)
+        where T : struct, IMensuraUnit, IEquatable<T> => Unsafe.As<double, T>(ref val);
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     internal static List<R> WrapAsList<T, R>(this T[] array)
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
     {
-        // Создаём пустой список с нулевой ёмкостью
+        if (array is null) return null!;
+
+        // 1. Физически меняем паспорт (MethodTable) массива на целевой тип R[]
+        object arrObj = array;
+        unsafe { *(nint*)*(nint*)Unsafe.AsPointer(ref arrObj) = typeof(R[]).TypeHandle.Value; }
+        R[] morphedArray = Unsafe.As<R[]>(arrObj);
+
+        // 2. Вшиваем его в новый список
         var list = new List<R>(0);
-
+        ref var mimic = ref Unsafe.As<List<R>, ListMimic<R>>(ref list);
-        // Получаем внутреннюю структуру списка
+        mimic.Items = morphedArray;
-        ref var mimic = ref Unsafe.As<List<R>, Mimics<T>>(ref list);
-
-        // Подменяем массив и устанавливаем размер
-        mimic.Items = array;
         mimic.Size = array.Length;
-        mimic.Version = 1; // любое ненулевое значение для консистенции
+        mimic.Version = 1;
 
         return list;
     }
@@ -55,16 +39,17 @@ internal static partial class CastExtensions
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
     {
-        // Создаём пустой список с нулевой ёмкостью
+        if (array is null) return null!;
+
+        object arrObj = array;
+        unsafe { *(nint*)*(nint*)Unsafe.AsPointer(ref arrObj) = typeof(R?[]).TypeHandle.Value; }
+        R?[] morphedArray = Unsafe.As<R?[]>(arrObj);
+
         var list = new List<R?>(0);
-
+        ref var mimic = ref Unsafe.As<List<R?>, ListMimic<R?>>(ref list);
-        // Получаем внутреннюю структуру списка
+        mimic.Items = morphedArray;
-        ref var mimic = ref Unsafe.As<List<R?>, Mimics<T?>>(ref list);
-
-        // Подменяем массив и устанавливаем размер
-        mimic.Items = array;
         mimic.Size = array.Length;
-        mimic.Version = 1; // любое ненулевое значение для консистенции
+        mimic.Version = 1;
 
         return list;
     }
@@ -73,16 +58,17 @@ internal static partial class CastExtensions
     internal static List<double> WrapAsList<T>(this T[] array)
         where T : struct, IMensuraUnit, IEquatable<T>
     {
-        // Создаём пустой список с нулевой ёмкостью
+        if (array is null) return null!;
+
+        object arrObj = array;
+        unsafe { *(nint*)*(nint*)Unsafe.AsPointer(ref arrObj) = typeof(double[]).TypeHandle.Value; }
+        double[] morphedArray = Unsafe.As<double[]>(arrObj);
+
         var list = new List<double>(0);
-
+        ref var mimic = ref Unsafe.As<List<double>, ListMimic<double>>(ref list);
-        // Получаем внутреннюю структуру списка
+        mimic.Items = morphedArray;
-        ref var mimic = ref Unsafe.As<List<double>, Mimics<T>>(ref list);
-
-        // Подменяем массив и устанавливаем размер
-        mimic.Items = array;
         mimic.Size = array.Length;
-        mimic.Version = 1; // любое ненулевое значение для консистенции
+        mimic.Version = 1;
 
         return list;
     }
@@ -91,16 +77,17 @@ internal static partial class CastExtensions
     internal static List<double?> WrapAsList<T>(this T?[] array)
         where T : struct, IMensuraUnit, IEquatable<T>
     {
-        // Создаём пустой список с нулевой ёмкостью
+        if (array is null) return null!;
+
+        object arrObj = array;
+        unsafe { *(nint*)*(nint*)Unsafe.AsPointer(ref arrObj) = typeof(double?[]).TypeHandle.Value; }
+        double?[] morphedArray = Unsafe.As<double?[]>(arrObj);
+
         var list = new List<double?>(0);
-
+        ref var mimic = ref Unsafe.As<List<double?>, ListMimic<double?>>(ref list);
-        // Получаем внутреннюю структуру списка
+        mimic.Items = morphedArray;
-        ref var mimic = ref Unsafe.As<List<double?>, Mimics<T?>>(ref list);
-
-        // Подменяем массив и устанавливаем размер
-        mimic.Items = array;
         mimic.Size = array.Length;
-        mimic.Version = 1; // любое ненулевое значение для консистенции
+        mimic.Version = 1;
 
         return list;
     }
@@ -108,16 +95,14 @@ internal static partial class CastExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     internal static List<double> WrapAsList(this double[] array)
     {
-        // Создаём пустой список с нулевой ёмкостью
+        if (array is null) return null!;
+
+        // Массив уже имеет тип double[], подмена MethodTable не требуется
         var list = new List<double>(0);
-
+        ref var mimic = ref Unsafe.As<List<double>, ListMimic<double>>(ref list);
-        // Получаем внутреннюю структуру списка
-        ref var mimic = ref Unsafe.As<List<double>, Mimics<double>>(ref list);
-
-        // Подменяем массив и устанавливаем размер
         mimic.Items = array;
         mimic.Size = array.Length;
-        mimic.Version = 1; // любое ненулевое значение для консистенции
+        mimic.Version = 1;
 
         return list;
     }
@@ -125,28 +110,75 @@ internal static partial class CastExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     internal static List<double?> WrapAsList(this double?[] array)
     {
-        // Создаём пустой список с нулевой ёмкостью
+        if (array is null) return null!;
+
+        // Массив уже имеет тип double?[], подмена MethodTable не требуется
         var list = new List<double?>(0);
-
+        ref var mimic = ref Unsafe.As<List<double?>, ListMimic<double?>>(ref list);
-        // Получаем внутреннюю структуру списка
-        ref var mimic = ref Unsafe.As<List<double?>, Mimics<double?>>(ref list);
-
-        // Подменяем массив и устанавливаем размер
         mimic.Items = array;
         mimic.Size = array.Length;
-        mimic.Version = 1; // любое ненулевое значение для консистенции
+        mimic.Version = 1;
 
         return list;
     }
 
 
 
+
+
+
+
+
+    #region Инфраструктура Нативного Доступа (Zero-Overhead)
+
+    // Генератор сверхбыстрого доступа к приватным полям List<T> через чистый IL.
+    // Работает со скоростью обычного обращения к полю (компилируется в смещение указателя).
+    private static class ListAccessor<T>
+    {
+        public delegate ref T[] GetItemsRefDelegate(List<T> list);
+        public static readonly GetItemsRefDelegate GetItemsRef;
+
+        static ListAccessor()
+        {
+            var field = typeof(List<T>).GetField("_items", BindingFlags.NonPublic | BindingFlags.Instance)
+                ?? throw new InvalidOperationException("CLR Layout changed: _items field not found.");
+
+            var dm = new DynamicMethod("GetItemsRef", typeof(T[]).MakeByRefType(), [typeof(List<T>)], typeof(ListAccessor<T>).Module, true);
+            var il = dm.GetILGenerator();
+            il.Emit(OpCodes.Ldarg_0);   // Загружаем ссылку на List<T>
+            il.Emit(OpCodes.Ldflda, field); // Получаем управляемый указатель (ref) на поле _items
+            il.Emit(OpCodes.Ret);       // Возвращаем его
+
+            GetItemsRef = dm.CreateDelegate<GetItemsRefDelegate>();
+        }
+    }
+
+    #endregion
+
+    #region Реализация ReCast со сменой MethodTable (In-Place Object Morphing)
+
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     internal static List<R> ReCast<T, R>(this List<T> list)
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
     {
-        return Unsafe.As<List<T>, List<R>>(ref list);
+        if (list is null) return null!;
+        unsafe
+        {
+            // 1. Морфим внутренний массив со скоростью мысли
+            T[] items = ListAccessor<T>.GetItemsRef(list);
+            if (items is not null)
+            {
+                object itemsObj = items;
+                *(nint*)*(nint*)Unsafe.AsPointer(ref itemsObj) = typeof(R[]).TypeHandle.Value;
+            }
+
+            // 2. Морфим сам заголовок List
+            object listObj = list;
+            *(nint*)*(nint*)Unsafe.AsPointer(ref listObj) = typeof(List<R>).TypeHandle.Value;
+
+            return Unsafe.As<List<R>>(listObj);
+        }
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -154,21 +186,63 @@ internal static partial class CastExtensions
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
     {
-        return Unsafe.As<List<T?>, List<R?>>(ref list);
+        if (list is null) return null!;
+        unsafe
+        {
+            T?[] items = ListAccessor<T?>.GetItemsRef(list);
+            if (items is not null)
+            {
+                object itemsObj = items;
+                *(nint*)*(nint*)Unsafe.AsPointer(ref itemsObj) = typeof(R?[]).TypeHandle.Value;
+            }
+
+            object listObj = list;
+            *(nint*)*(nint*)Unsafe.AsPointer(ref listObj) = typeof(List<R?>).TypeHandle.Value;
+
+            return Unsafe.As<List<R?>>(listObj);
+        }
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     internal static List<double> ReCast<T>(this List<T> list)
         where T : struct, IMensuraUnit, IEquatable<T>
     {
-        return Unsafe.As<List<T>, List<double>>(ref list);
+        if (list is null) return null!;
+        unsafe
+        {
+            T[] items = ListAccessor<T>.GetItemsRef(list);
+            if (items is not null)
+            {
+                object itemsObj = items;
+                *(nint*)*(nint*)Unsafe.AsPointer(ref itemsObj) = typeof(double[]).TypeHandle.Value;
+            }
+
+            object listObj = list;
+            *(nint*)*(nint*)Unsafe.AsPointer(ref listObj) = typeof(List<double>).TypeHandle.Value;
+
+            return Unsafe.As<List<double>>(listObj);
+        }
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     internal static List<double?> ReCast<T>(this List<T?> list)
         where T : struct, IMensuraUnit, IEquatable<T>
     {
-        return Unsafe.As<List<T?>, List<double?>>(ref list);
+        if (list is null) return null!;
+        unsafe
+        {
+            T?[] items = ListAccessor<T?>.GetItemsRef(list);
+            if (items is not null)
+            {
+                object itemsObj = items;
+                *(nint*)*(nint*)Unsafe.AsPointer(ref itemsObj) = typeof(double?[]).TypeHandle.Value;
+            }
+
+            object listObj = list;
+            *(nint*)*(nint*)Unsafe.AsPointer(ref listObj) = typeof(List<double?>).TypeHandle.Value;
+
+            return Unsafe.As<List<double?>>(listObj);
+        }
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -176,7 +250,14 @@ internal static partial class CastExtensions
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
     {
-        return Unsafe.As<T[], R[]>(ref array);
+        if (array is null) return null!;
+        unsafe
+        {
+            object obj = array;
+            // Ужатие магии: берем адрес переменной на стеке -> читаем адрес объекта в куче -> пишем туда новый MethodTable
+            *(nint*)*(nint*)Unsafe.AsPointer(ref obj) = typeof(R[]).TypeHandle.Value;
+            return Unsafe.As<R[]>(obj);
+        }
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -184,34 +265,66 @@ internal static partial class CastExtensions
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
     {
-        return Unsafe.As<T?[], R?[]>(ref array);
+        if (array is null) return null!;
+        unsafe
+        {
+            object obj = array;
+            *(nint*)*(nint*)Unsafe.AsPointer(ref obj) = typeof(R?[]).TypeHandle.Value;
+            return Unsafe.As<R?[]>(obj);
+        }
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     internal static double[] ReCast<T>(this T[] array)
         where T : struct, IMensuraUnit, IEquatable<T>
     {
-        return Unsafe.As<T[], double[]>(ref array);
+        if (array is null) return null!;
+        unsafe
+        {
+            object obj = array;
+            *(nint*)*(nint*)Unsafe.AsPointer(ref obj) = typeof(double[]).TypeHandle.Value;
+            return Unsafe.As<double[]>(obj);
+        }
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     internal static double?[] ReCast<T>(this T?[] array)
         where T : struct, IMensuraUnit, IEquatable<T>
     {
-        return Unsafe.As<T?[], double?[]>(ref array);
+        if (array is null) return null!;
+        unsafe
+        {
+            object obj = array;
+            *(nint*)*(nint*)Unsafe.AsPointer(ref obj) = typeof(double?[]).TypeHandle.Value;
+            return Unsafe.As<double?[]>(obj);
+        }
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     internal static R[] ReCast<R>(this double[] array)
         where R : struct, IMensuraUnit, IEquatable<R>
     {
-        return Unsafe.As<double[], R[]>(ref array);
+        if (array is null) return null!;
+        unsafe
+        {
+            object obj = array;
+            *(nint*)*(nint*)Unsafe.AsPointer(ref obj) = typeof(R[]).TypeHandle.Value;
+            return Unsafe.As<R[]>(obj);
+        }
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     internal static R?[] ReCast<R>(this double?[] array)
         where R : struct, IMensuraUnit, IEquatable<R>
     {
-        return Unsafe.As<double?[], R?[]>(ref array);
+        if (array is null) return null!;
+        unsafe
+        {
+            object obj = array;
+            *(nint*)*(nint*)Unsafe.AsPointer(ref obj) = typeof(R?[]).TypeHandle.Value;
+            return Unsafe.As<R?[]>(obj);
+        }
     }
+
+    #endregion
 }

QWERTYkez.Mensura/Extensions/CollectionsDivideExtensions.cs

@@ -264,80 +264,6 @@ internal static partial class CollectionsDivideExtensions
         return resultArray.WrapAsList<R, R>();
     }
 
-    // === ICollection<T> ===
-    internal static void Div<T, R>(this ICollection<T> units, double divisor, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { DivideCore(array, divisor, count, destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).DivideCore(divisor, count, destination); return; }
-
-        int i = 0;
-        double invDivisor = 1.0 / divisor;
-        foreach (var item in units)
-            destination[i++] = (item.ToDouble() * invDivisor).ToUnit<R>();
-    }
-    internal static void Div<T, R>(this ICollection<T?> units, double divisor, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.DivideCore(divisor, count, destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).DivideCore(divisor, count, destination); return; }
-
-        int i = 0;
-        double invDivisor = 1.0 / divisor;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (item.Value.ToDouble() * invDivisor).ToUnit<R>() : null;
-    }
-    internal static void Div<T, R>(this double dividend, ICollection<T> units, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { dividend.DivideCore(array, count, destination); return; }
-        if (units is List<T> list) { dividend.DivideCore(CollectionsMarshal.AsSpan(list), count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (dividend / item.ToDouble()).ToUnit<R>();
-    }
-    internal static void Div<T, R>(this double dividend, ICollection<T?> units, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { dividend.DivideCore(array, count, destination); return; }
-        if (units is List<T?> list) { dividend.DivideCore(CollectionsMarshal.AsSpan(list), count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (dividend / item.Value.ToDouble()).ToUnit<R>() : null;
-    }
-
     // === IReadOnlyCollection<T> ===
     internal static void Div<T, R>(this IReadOnlyCollection<T> units, double divisor, Span<R> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -454,12 +380,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is T[] array) return array.Div<T, R>(divisor);
         if (units is List<T> list) return list.Div<T, R>(divisor);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.Div(divisor, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -475,12 +395,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Div<T, R>(divisor);
         if (units is List<T?> list) return list.Div<T, R>(divisor);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Div(divisor, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -496,12 +410,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is T[] array) return dividend.Div<T, R>(array);
         if (units is List<T> list) return dividend.Div<T, R>(list);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            dividend.Div(arr, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -517,12 +425,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is T?[] array) return dividend.Div<T, R>(array);
         if (units is List<T?> list) return dividend.Div<T, R>(list);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            dividend.Div(arr, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -670,76 +572,6 @@ internal static partial class CollectionsDivideExtensions
         return resultArray.WrapAsList<T, T>();
     }
 
-    // === ICollection<T> ===
-    internal static void Div<T>(this ICollection<T> units, double divisor, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { array.Div(divisor, destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).Div(divisor, destination); return; }
-
-        int i = 0;
-        double invDivisor = 1.0 / divisor;
-        foreach (var item in units)
-            destination[i++] = (item.ToDouble() * invDivisor).ToUnit<T>();
-    }
-    internal static void Div<T>(this ICollection<T?> units, double divisor, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.Div(divisor, destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Div(divisor, destination); return; }
-
-        int i = 0;
-        double invDivisor = 1.0 / divisor;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (item.Value.ToDouble() * invDivisor).ToUnit<T>() : null;
-    }
-    internal static void Div<T>(this double dividend, ICollection<T> units, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { dividend.Div(array, destination); return; }
-        if (units is List<T> list) { dividend.Div(CollectionsMarshal.AsSpan(list), destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (dividend / item.ToDouble()).ToUnit<T>();
-    }
-    internal static void Div<T>(this double dividend, ICollection<T?> units, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { dividend.Div(array, destination); return; }
-        if (units is List<T?> list) { dividend.Div(CollectionsMarshal.AsSpan(list), destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (dividend / item.Value.ToDouble()).ToUnit<T>() : null;
-    }
-
     // === IReadOnlyCollection<T> ===
     internal static void Div<T>(this IReadOnlyCollection<T> units, double divisor, Span<T> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -847,12 +679,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is T[] array) return array.Div(divisor);
         if (units is List<T> list) return list.Div(divisor);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.Div(divisor, arr);
-            return arr;
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -867,12 +693,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Div(divisor);
         if (units is List<T?> list) return list.Div(divisor);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Div(divisor, arr);
-            return arr;
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -887,12 +707,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is T[] array) return dividend.Div(array);
         if (units is List<T> list) return dividend.Div(list);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            dividend.Div(arr, arr);
-            return arr;
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -907,12 +721,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is T?[] array) return dividend.Div(array);
         if (units is List<T?> list) return dividend.Div(list);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            dividend.Div(arr, arr);
-            return arr;
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -1365,76 +1173,6 @@ internal static partial class CollectionsDivideExtensions
         return resultArray.WrapAsList<T, T>();
     }
 
-    // === ICollection<T> ===
-    internal static void Div<T>(this ICollection<double> units, T divisor, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is double[] array) { array.Div(divisor, destination); return; }
-        if (units is List<double> list) { CollectionsMarshal.AsSpan(list).Div(divisor, destination); return; }
-
-        int i = 0;
-        double invDivisor = 1.0 / divisor.ToDouble();
-        foreach (var item in units)
-            destination[i++] = (item * invDivisor).ToUnit<T>();
-    }
-    internal static void Div<T>(this ICollection<double?> units, T divisor, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is double?[] array) { array.Div(divisor, destination); return; }
-        if (units is List<double?> list) { CollectionsMarshal.AsSpan(list).Div(divisor, destination); return; }
-
-        int i = 0;
-        double invDivisor = 1.0 / divisor.ToDouble();
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (item.Value * invDivisor).ToUnit<T>() : null;
-    }
-    internal static void Div<T>(this T dividend, ICollection<double> units, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is double[] array) { dividend.Div(array, destination); return; }
-        if (units is List<double> list) { dividend.Div(CollectionsMarshal.AsSpan(list), destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (dividend.ToDouble() / item).ToUnit<T>();
-    }
-    internal static void Div<T>(this T dividend, ICollection<double?> units, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is double?[] array) { dividend.Div(array, destination); return; }
-        if (units is List<double?> list) { dividend.Div(CollectionsMarshal.AsSpan(list), destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (dividend.ToDouble() / item.Value).ToUnit<T>() : null;
-    }
-
     // === IReadOnlyCollection<T> ===
     internal static void Div<T>(this IReadOnlyCollection<double> units, T divisor, Span<T> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -1542,12 +1280,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is double[] array) return array.Div(divisor);
         if (units is List<double> list) return list.Div(divisor);
-        if (units is ICollection<double> col)
-        {
-            var arr = col.ToArray();
-            arr.DivCore(divisor.ToDouble(), arr.Length, arr);
-            return arr.ReCast<T>();
-        }
         if (units is IReadOnlyCollection<double> roc)
         {
             var arr = roc.ToArray();
@@ -1562,12 +1294,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is double?[] array) return array.Div(divisor);
         if (units is List<double?> list) return list.Div(divisor);
-        if (units is ICollection<double?> col)
-        {
-            var arr = col.ToArray();
-            arr.DivCore(divisor.ToDouble(), arr.Length, arr);
-            return arr.ReCast<T>();
-        }
         if (units is IReadOnlyCollection<double?> roc)
         {
             var arr = roc.ToArray();
@@ -1582,12 +1308,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is double[] array) return dividend.Div(array);
         if (units is List<double> list) return dividend.Div(list);
-        if (units is ICollection<double> col)
-        {
-            var arr = col.ToArray();
-            dividend.ToDouble().DivCore(arr, arr.Length, arr);
-            return arr.ReCast<T>();
-        }
         if (units is IReadOnlyCollection<double> roc)
         {
             var arr = roc.ToArray();
@@ -1602,12 +1322,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is double?[] array) return dividend.Div(array);
         if (units is List<double?> list) return dividend.Div(list);
-        if (units is ICollection<double?> col)
-        {
-            var arr = col.ToArray();
-            dividend.ToDouble().DivCore(arr, arr.Length, arr);
-            return arr.ReCast<T>();
-        }
         if (units is IReadOnlyCollection<double?> roc)
         {
             var arr = roc.ToArray();
@@ -1915,76 +1629,6 @@ internal static partial class CollectionsDivideExtensions
         return resultArray.WrapAsList();
     }
 
-    // === ICollection<T> ===
-    internal static void Div<T>(this ICollection<T> units, T divisor, Span<double> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { array.Div(divisor, destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).Div(divisor, destination); return; }
-
-        int i = 0;
-        double invDivisor = 1.0 / divisor.ToDouble();
-        foreach (var item in units)
-            destination[i++] = item.ToDouble() * invDivisor;
-    }
-    internal static void Div<T>(this ICollection<T?> units, T divisor, Span<double?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.Div(divisor, destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Div(divisor, destination); return; }
-
-        int i = 0;
-        double invDivisor = 1.0 / divisor.ToDouble();
-        foreach (var item in units)
-            destination[i++] = item.HasValue ? item.Value.ToDouble() * invDivisor : null;
-    }
-    internal static void Div<T>(this T dividend, ICollection<T> units, Span<double> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { dividend.Div(array, destination); return; }
-        if (units is List<T> list) { dividend.Div(CollectionsMarshal.AsSpan(list), destination); return; }
-
-        int i = 0;
-        var div = dividend.ToDouble();
-        foreach (var item in units)
-            destination[i++] = div / item.ToDouble();
-    }
-    internal static void Div<T>(this T dividend, ICollection<T?> units, Span<double?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { dividend.Div(array, destination); return; }
-        if (units is List<T?> list) { dividend.Div(CollectionsMarshal.AsSpan(list), destination); return; }
-
-        int i = 0;
-        var div = dividend.ToDouble();
-        foreach (var item in units)
-            destination[i++] = item.HasValue ? div / item.Value.ToDouble() : null;
-    }
-
     // === IReadOnlyCollection<T> ===
     internal static void Div<T>(this IReadOnlyCollection<T> units, T divisor, Span<double> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -2092,12 +1736,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is T[] array) return array.Div(divisor);
         if (units is List<T> list) return list.Div(divisor);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.DivideCore(divisor.ToDouble(), arr.Length, arr);
-            return arr.ReCast();
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -2112,12 +1750,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Div(divisor);
         if (units is List<T?> list) return list.Div(divisor);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.DivideCore(divisor.ToDouble(), arr.Length, arr);
-            return arr.ReCast();
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -2132,12 +1764,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is T[] array) return dividend.Div(array);
         if (units is List<T> list) return dividend.Div(list);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            dividend.ToDouble().DivideCore(arr, arr.Length, arr);
-            return arr.ReCast();
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -2152,12 +1778,6 @@ internal static partial class CollectionsDivideExtensions
         if (units is null) return null!;
         if (units is T?[] array) return dividend.Div(array);
         if (units is List<T?> list) return dividend.Div(list);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            dividend.ToDouble().DivideCore(arr, arr.Length, arr);
-            return arr.ReCast();
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();

QWERTYkez.Mensura/Extensions/CollectionsMinusExtensions.cs

@@ -259,78 +259,6 @@ internal static partial class CollectionsMinusExtensions
         return resultArray.WrapAsList<R, R>();
     }
 
-    // === ICollection<T> ===
-    internal static void Minus<T, R>(this ICollection<T> units, double subtrahend, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { array.MinusCore(subtrahend, count, destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).MinusCore(subtrahend, count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (item.ToDouble() - subtrahend).ToUnit<R>();
-    }
-    internal static void Minus<T, R>(this ICollection<T?> units, double subtrahend, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.MinusCore(subtrahend, count, destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).MinusCore(subtrahend, count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (item.Value.ToDouble() - subtrahend).ToUnit<R>() : null;
-    }
-    internal static void Minus<T, R>(this double minuend, ICollection<T> units, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { minuend.MinusCore(array, count, destination); return; }
-        if (units is List<T> list) { minuend.MinusCore(CollectionsMarshal.AsSpan(list), count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (minuend - item.ToDouble()).ToUnit<R>();
-    }
-    internal static void Minus<T, R>(this double minuend, ICollection<T?> units, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { minuend.MinusCore(array, count, destination); return; }
-        if (units is List<T?> list) { minuend.MinusCore(CollectionsMarshal.AsSpan(list), count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (minuend - item.Value.ToDouble()).ToUnit<R>() : null;
-    }
-
     // === IReadOnlyCollection<T> ===
     internal static void Minus<T, R>(this IReadOnlyCollection<T> units, double subtrahend, Span<R> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -443,12 +371,6 @@ internal static partial class CollectionsMinusExtensions
         if (units is null) return null!;
         if (units is T[] array) return array.Minus<T, R>(subtrahend);
         if (units is List<T> list) return list.Minus<T, R>(subtrahend);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.Minus(subtrahend, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -464,12 +386,6 @@ internal static partial class CollectionsMinusExtensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Minus<T, R>(subtrahend);
         if (units is List<T?> list) return list.Minus<T, R>(subtrahend);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Minus(subtrahend, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -485,12 +401,6 @@ internal static partial class CollectionsMinusExtensions
         if (units is null) return null!;
         if (units is T[] array) return minuend.Minus<T, R>(array);
         if (units is List<T> list) return minuend.Minus<T, R>(list);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            minuend.Minus(arr, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -506,12 +416,6 @@ internal static partial class CollectionsMinusExtensions
         if (units is null) return null!;
         if (units is T?[] array) return minuend.Minus<T, R>(array);
         if (units is List<T?> list) return minuend.Minus<T, R>(list);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            minuend.Minus(arr, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -660,74 +564,6 @@ internal static partial class CollectionsMinusExtensions
         return resultArray.WrapAsList<T, T>();
     }
 
-    // === ICollection<T> ===
-    internal static void Minus<T>(this ICollection<T> units, double subtrahend, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { array.Minus(subtrahend, destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).Minus(subtrahend, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (item.ToDouble() - subtrahend).ToUnit<T>();
-    }
-    internal static void Minus<T>(this ICollection<T?> units, double subtrahend, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.Minus(subtrahend, destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Minus(subtrahend, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (item.Value.ToDouble() - subtrahend).ToUnit<T>() : null;
-    }
-    internal static void Minus<T>(this double minuend, ICollection<T> units, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { minuend.Minus(array, destination); return; }
-        if (units is List<T> list) { minuend.Minus(CollectionsMarshal.AsSpan(list), destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (minuend - item.ToDouble()).ToUnit<T>();
-    }
-    internal static void Minus<T>(this double minuend, ICollection<T?> units, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { minuend.Minus(array, destination); return; }
-        if (units is List<T?> list) { minuend.Minus(CollectionsMarshal.AsSpan(list), destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (minuend - item.Value.ToDouble()).ToUnit<T>() : null;
-    }
-
     // === IReadOnlyCollection<T> ===
     internal static void Minus<T>(this IReadOnlyCollection<T> units, double subtrahend, Span<T> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -831,12 +667,6 @@ internal static partial class CollectionsMinusExtensions
         if (units is null) return null!;
         if (units is T[] array) return array.Minus(subtrahend);
         if (units is List<T> list) return list.Minus(subtrahend);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.Minus(subtrahend, arr);
-            return arr;
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -851,12 +681,6 @@ internal static partial class CollectionsMinusExtensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Minus(subtrahend);
         if (units is List<T?> list) return list.Minus(subtrahend);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Minus(subtrahend, arr);
-            return arr;
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -871,12 +695,6 @@ internal static partial class CollectionsMinusExtensions
         if (units is null) return null!;
         if (units is T[] array) return minuend.Minus(array);
         if (units is List<T> list) return minuend.Minus(list);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            minuend.Minus(arr, arr);
-            return arr;
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -891,12 +709,6 @@ internal static partial class CollectionsMinusExtensions
         if (units is null) return null!;
         if (units is T?[] array) return minuend.Minus(array);
         if (units is List<T?> list) return minuend.Minus(list);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            minuend.Minus(arr, arr);
-            return arr;
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -1339,76 +1151,6 @@ internal static partial class CollectionsMinusExtensions
         return resultArray.WrapAsList<T, T>();
     }
 
-    // === ICollection<T> ===
-    internal static void Minus<T>(this ICollection<double> units, T divisor, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is double[] array) { array.Minus(divisor, destination); return; }
-        if (units is List<double> list) { CollectionsMarshal.AsSpan(list).Minus(divisor, destination); return; }
-
-        int i = 0;
-        double invMinusisor = 1.0 / divisor.ToDouble();
-        foreach (var item in units)
-            destination[i++] = (item * invMinusisor).ToUnit<T>();
-    }
-    internal static void Minus<T>(this ICollection<double?> units, T divisor, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is double?[] array) { array.Minus(divisor, destination); return; }
-        if (units is List<double?> list) { CollectionsMarshal.AsSpan(list).Minus(divisor, destination); return; }
-
-        int i = 0;
-        double invMinusisor = 1.0 / divisor.ToDouble();
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (item.Value * invMinusisor).ToUnit<T>() : null;
-    }
-    internal static void Minus<T>(this T dividend, ICollection<double> units, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is double[] array) { dividend.Minus(array, destination); return; }
-        if (units is List<double> list) { dividend.Minus(CollectionsMarshal.AsSpan(list), destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (dividend.ToDouble() / item).ToUnit<T>();
-    }
-    internal static void Minus<T>(this T dividend, ICollection<double?> units, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is double?[] array) { dividend.Minus(array, destination); return; }
-        if (units is List<double?> list) { dividend.Minus(CollectionsMarshal.AsSpan(list), destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (dividend.ToDouble() / item.Value).ToUnit<T>() : null;
-    }
-
     // === IReadOnlyCollection<T> ===
     internal static void Minus<T>(this IReadOnlyCollection<double> units, T divisor, Span<T> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -1516,12 +1258,6 @@ internal static partial class CollectionsMinusExtensions
         if (units is null) return null!;
         if (units is double[] array) return array.Minus(divisor);
         if (units is List<double> list) return list.Minus(divisor);
-        if (units is ICollection<double> col)
-        {
-            var arr = col.ToArray();
-            arr.MinusCore(divisor.ToDouble(), arr.Length, arr);
-            return arr.ReCast<T>();
-        }
         if (units is IReadOnlyCollection<double> roc)
         {
             var arr = roc.ToArray();
@@ -1536,12 +1272,6 @@ internal static partial class CollectionsMinusExtensions
         if (units is null) return null!;
         if (units is double?[] array) return array.Minus(divisor);
         if (units is List<double?> list) return list.Minus(divisor);
-        if (units is ICollection<double?> col)
-        {
-            var arr = col.ToArray();
-            arr.MinusCore(divisor.ToDouble(), arr.Length, arr);
-            return arr.ReCast<T>();
-        }
         if (units is IReadOnlyCollection<double?> roc)
         {
             var arr = roc.ToArray();
@@ -1556,12 +1286,6 @@ internal static partial class CollectionsMinusExtensions
         if (units is null) return null!;
         if (units is double[] array) return dividend.Minus(array);
         if (units is List<double> list) return dividend.Minus(list);
-        if (units is ICollection<double> col)
-        {
-            var arr = col.ToArray();
-            dividend.ToDouble().MinusCore(arr, arr.Length, arr);
-            return arr.ReCast<T>();
-        }
         if (units is IReadOnlyCollection<double> roc)
         {
             var arr = roc.ToArray();
@@ -1576,12 +1300,6 @@ internal static partial class CollectionsMinusExtensions
         if (units is null) return null!;
         if (units is double?[] array) return dividend.Minus(array);
         if (units is List<double?> list) return dividend.Minus(list);
-        if (units is ICollection<double?> col)
-        {
-            var arr = col.ToArray();
-            dividend.ToDouble().MinusCore(arr, arr.Length, arr);
-            return arr.ReCast<T>();
-        }
         if (units is IReadOnlyCollection<double?> roc)
         {
             var arr = roc.ToArray();

QWERTYkez.Mensura/Extensions/CollectionsMultiplyExtensions.cs

@@ -162,53 +162,6 @@ internal static partial class CollectionsMultiplyExtensions
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R> => units.Mul<T, R>(multiplicator);
 
-    // === ICollection<T> ===
-    internal static void Mul<T, R>(this ICollection<T> units, double multiplicator, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { MultiplyCore(array, multiplicator, count, destination); return; }
-        if (units is List<T> list) { MultiplyCore(CollectionsMarshal.AsSpan(list), multiplicator, count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (item.ToDouble() * multiplicator).ToUnit<R>();
-    }
-    internal static void Mul<T, R>(this ICollection<T?> units, double multiplicator, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { MultiplyCore(array, multiplicator, count, destination); return; }
-        if (units is List<T?> list) { MultiplyCore(CollectionsMarshal.AsSpan(list), multiplicator, count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (item.Value.ToDouble() * multiplicator).ToUnit<R>() : null;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void Mul<T, R>(this double multiplicator, ICollection<T> units, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R> => units.Mul(multiplicator, destination);
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void Mul<T, R>(this double multiplicator, ICollection<T?> units, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R> => units.Mul(multiplicator, destination);
-
     // === IReadOnlyCollection<T> ===
     internal static void Mul<T, R>(this IReadOnlyCollection<T> units, double multiplicator, Span<R> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -281,12 +234,6 @@ internal static partial class CollectionsMultiplyExtensions
         if (units is null) return null!;
         if (units is T[] array) return array.Mul<T, R>(multiplicator);
         if (units is List<T> list) return list.Mul<T, R>(multiplicator);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.Mul(multiplicator, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -302,12 +249,6 @@ internal static partial class CollectionsMultiplyExtensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Mul<T, R>(multiplicator);
         if (units is List<T?> list) return list.Mul<T, R>(multiplicator);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Mul(multiplicator, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -424,49 +365,6 @@ internal static partial class CollectionsMultiplyExtensions
     internal static List<T?> Mul<T>(this double multiplicator, List<T?> units)
         where T : struct, IMensuraUnit, IEquatable<T> => units.Mul(multiplicator);
 
-    // === ICollection<T> ===
-    internal static void Mul<T>(this ICollection<T> units, double multiplicator, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { array.Mul(multiplicator, destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).Mul(multiplicator, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (item.ToDouble() * multiplicator).ToUnit<T>();
-    }
-    internal static void Mul<T>(this ICollection<T?> units, double multiplicator, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.Mul(multiplicator, destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Mul(multiplicator, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (item.Value.ToDouble() * multiplicator).ToUnit<T>() : null;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void Mul<T>(this double multiplicator, ICollection<T> units, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T> => units.Mul<T>(multiplicator, destination);
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void Mul<T>(this double multiplicator, ICollection<T?> units, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T> => units.Mul<T>(multiplicator, destination);
-
     // === IReadOnlyCollection<T> ===
     internal static void Mul<T>(this IReadOnlyCollection<T> units, double multiplicator, Span<T> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -532,12 +430,6 @@ internal static partial class CollectionsMultiplyExtensions
         if (units is null) return null!;
         if (units is T[] array) return array.Mul(multiplicator);
         if (units is List<T> list) return list.Mul(multiplicator);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.Mul(multiplicator, arr);
-            return arr;
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -552,12 +444,6 @@ internal static partial class CollectionsMultiplyExtensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Mul(multiplicator);
         if (units is List<T?> list) return list.Mul(multiplicator);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Mul(multiplicator, arr);
-            return arr;
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -832,49 +718,6 @@ internal static partial class CollectionsMultiplyExtensions
     internal static List<T?> Mul<T>(this T multiplicator, List<double?> units)
         where T : struct, IMensuraUnit, IEquatable<T> => units.Mul(multiplicator);
 
-    // === ICollection<T> ===
-    internal static void Mul<T>(this ICollection<double> units, T multiplicator, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is double[] array) { array.MultiplyCore(multiplicator.ToDouble(), array.Length, destination); return; }
-        if (units is List<double> list) { CollectionsMarshal.AsSpan(list).MultiplyCore(multiplicator.ToDouble(), list.Count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (item * multiplicator.ToDouble()).ToUnit<T>();
-    }
-    internal static void Mul<T>(this ICollection<double?> units, T multiplicator, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is double?[] array) { array.MultiplyCore(multiplicator.ToDouble(), array.Length, destination); return; }
-        if (units is List<double?> list) { CollectionsMarshal.AsSpan(list).MultiplyCore(multiplicator.ToDouble(), list.Count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (item.Value * multiplicator.ToDouble()).ToUnit<T>() : null;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void Mul<T>(this T multiplicator, ICollection<double> units, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T> => units.Mul<T>(multiplicator, destination);
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void Mul<T>(this T multiplicator, ICollection<double?> units, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T> => units.Mul<T>(multiplicator, destination);
-
     // === IReadOnlyCollection<T> ===
     internal static void Mul<T>(this IReadOnlyCollection<double> units, T multiplicator, Span<T> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -940,12 +783,6 @@ internal static partial class CollectionsMultiplyExtensions
         if (units is null) return null!;
         if (units is double[] array) return array.Mul(multiplicator);
         if (units is List<double> list) return list.Mul(multiplicator);
-        if (units is ICollection<double> col)
-        {
-            var arr = col.ToArray();
-            arr.MultiplyCore(multiplicator.ToDouble(), arr.Length, arr);
-            return arr.ReCast<T>();
-        }
         if (units is IReadOnlyCollection<double> roc)
         {
             var arr = roc.ToArray();
@@ -960,12 +797,6 @@ internal static partial class CollectionsMultiplyExtensions
         if (units is null) return null!;
         if (units is double?[] array) return array.Mul(multiplicator);
         if (units is List<double?> list) return list.Mul(multiplicator);
-        if (units is ICollection<double?> col)
-        {
-            var arr = col.ToArray();
-            arr.MultiplyCore(multiplicator.ToDouble(), arr.Length, arr);
-            return arr.ReCast<T>();
-        }
         if (units is IReadOnlyCollection<double?> roc)
         {
             var arr = roc.ToArray();

QWERTYkez.Mensura/Extensions/CollectionsPlusExtensions.cs

@@ -163,53 +163,6 @@ internal static partial class CollectionsPlusExtensions
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R> => units.Plus<T, R>(summand);
 
-    // === ICollection<T> ===
-    internal static void Plus<T, R>(this ICollection<T> units, double summand, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { PlusCore(array, summand, count, destination); return; }
-        if (units is List<T> list) { PlusCore(CollectionsMarshal.AsSpan(list), summand, count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (item.ToDouble() + summand).ToUnit<R>();
-    }
-    internal static void Plus<T, R>(this ICollection<T?> units, double summand, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { PlusCore(array, summand, count, destination); return; }
-        if (units is List<T?> list) { PlusCore(CollectionsMarshal.AsSpan(list), summand, count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (item.Value.ToDouble() + summand).ToUnit<R>() : null;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void Plus<T, R>(this double summand, ICollection<T> units, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R> => units.Plus(summand, destination);
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void Plus<T, R>(this double summand, ICollection<T?> units, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R> => units.Plus(summand, destination);
-
     // === IReadOnlyCollection<T> ===
     internal static void Plus<T, R>(this IReadOnlyCollection<T> units, double summand, Span<R> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -282,12 +235,6 @@ internal static partial class CollectionsPlusExtensions
         if (units is null) return null!;
         if (units is T[] array) return array.Plus<T, R>(summand);
         if (units is List<T> list) return list.Plus<T, R>(summand);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.Plus(summand, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -303,12 +250,6 @@ internal static partial class CollectionsPlusExtensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Plus<T, R>(summand);
         if (units is List<T?> list) return list.Plus<T, R>(summand);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Plus(summand, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -425,49 +366,6 @@ internal static partial class CollectionsPlusExtensions
     internal static List<T?> Plus<T>(this double summand, List<T?> units)
         where T : struct, IMensuraUnit, IEquatable<T> => units.Plus(summand);
 
-    // === ICollection<T> ===
-    internal static void Plus<T>(this ICollection<T> units, double summand, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { array.Plus(summand, destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).Plus(summand, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (item.ToDouble() + summand).ToUnit<T>();
-    }
-    internal static void Plus<T>(this ICollection<T?> units, double summand, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.Plus(summand, destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Plus(summand, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (item.Value.ToDouble() + summand).ToUnit<T>() : null;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void Plus<T>(this double summand, ICollection<T> units, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T> => units.Plus<T>(summand, destination);
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void Plus<T>(this double summand, ICollection<T?> units, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T> => units.Plus<T>(summand, destination);
-
     // === IReadOnlyCollection<T> ===
     internal static void Plus<T>(this IReadOnlyCollection<T> units, double summand, Span<T> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -533,12 +431,6 @@ internal static partial class CollectionsPlusExtensions
         if (units is null) return null!;
         if (units is T[] array) return array.Plus(summand);
         if (units is List<T> list) return list.Plus(summand);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.Plus(summand, arr);
-            return arr;
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -553,12 +445,6 @@ internal static partial class CollectionsPlusExtensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Plus(summand);
         if (units is List<T?> list) return list.Plus(summand);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Plus(summand, arr);
-            return arr;
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -837,49 +723,6 @@ internal static partial class CollectionsPlusExtensions
     internal static List<T?> Plus<T>(this T summand, List<double?> units)
         where T : struct, IMensuraUnit, IEquatable<T> => units.Plus(summand);
 
-    // === ICollection<T> ===
-    internal static void Plus<T>(this ICollection<double> units, T summand, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is double[] array) { array.PlusCore(summand.ToDouble(), array.Length, destination); return; }
-        if (units is List<double> list) { CollectionsMarshal.AsSpan(list).PlusCore(summand.ToDouble(), list.Count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = (item + summand.ToDouble()).ToUnit<T>();
-    }
-    internal static void Plus<T>(this ICollection<double?> units, T summand, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is double?[] array) { array.PlusCore(summand.ToDouble(), array.Length, destination); return; }
-        if (units is List<double?> list) { CollectionsMarshal.AsSpan(list).PlusCore(summand.ToDouble(), list.Count, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? (item.Value + summand.ToDouble()).ToUnit<T>() : null;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void Plus<T>(this T summand, ICollection<double> units, Span<T> destination)
-        where T : struct, IMensuraUnit, IEquatable<T> => units.Plus<T>(summand, destination);
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void Plus<T>(this T summand, ICollection<double?> units, Span<T?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T> => units.Plus<T>(summand, destination);
-
     // === IReadOnlyCollection<T> ===
     internal static void Plus<T>(this IReadOnlyCollection<double> units, T summand, Span<T> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -945,12 +788,6 @@ internal static partial class CollectionsPlusExtensions
         if (units is null) return null!;
         if (units is double[] array) return array.Plus(summand);
         if (units is List<double> list) return list.Plus(summand);
-        if (units is ICollection<double> col)
-        {
-            var arr = col.ToArray();
-            arr.PlusCore(summand.ToDouble(), arr.Length, arr);
-            return arr.ReCast<T>();
-        }
         if (units is IReadOnlyCollection<double> roc)
         {
             var arr = roc.ToArray();
@@ -965,12 +802,6 @@ internal static partial class CollectionsPlusExtensions
         if (units is null) return null!;
         if (units is double?[] array) return array.Plus(summand);
         if (units is List<double?> list) return list.Plus(summand);
-        if (units is ICollection<double?> col)
-        {
-            var arr = col.ToArray();
-            arr.PlusCore(summand.ToDouble(), arr.Length, arr);
-            return arr.ReCast<T>();
-        }
         if (units is IReadOnlyCollection<double?> roc)
         {
             var arr = roc.ToArray();

QWERTYkez.Mensura/Extensions/CollectionsPow2Extensions.cs

@@ -7,8 +7,8 @@ internal static partial class CollectionsPow2Extensions
 
     // === ВТОРАЯ СТЕПЕНЬ ==========================================
 
-    // === Pow2Core2 === SIMD
+    // === Pow2Core === SIMD
-    internal static void Pow2Core2<T, R>(this ReadOnlySpan<T> units, int len, Span<R> destination)
+    internal static void Pow2Core<T, R>(this ReadOnlySpan<T> units, int len, Span<R> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
     {
@@ -43,7 +43,7 @@ internal static partial class CollectionsPow2Extensions
             dstDouble[i] = val * val;
         }
     }
-    internal static void Pow2Core2<T, R>(this ReadOnlySpan<T?> units, int len, Span<R?> destination)
+    internal static void Pow2Core<T, R>(this ReadOnlySpan<T?> units, int len, Span<R?> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
     {
@@ -106,7 +106,7 @@ internal static partial class CollectionsPow2Extensions
         if (len > destination.Length)
             throw new ArgumentException("Целевой буфер destination меньше исходного source.");
 
-        units.Pow2Core2(len, destination);
+        units.Pow2Core(len, destination);
     }
     internal static void Pow2<T, R>(this ReadOnlySpan<T?> units, Span<R?> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -117,7 +117,7 @@ internal static partial class CollectionsPow2Extensions
         if (len > destination.Length)
             throw new ArgumentException("Целевой буфер destination меньше исходного source.");
 
-        units.Pow2Core2(len, destination);
+        units.Pow2Core(len, destination);
     }
 
     // === Array ===
@@ -172,43 +172,6 @@ internal static partial class CollectionsPow2Extensions
         return resultArray.WrapAsList<R, R>();
     }
 
-    // === ICollection<Length> ===
-    internal static void Pow2<T, R>(this ICollection<T> units, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { array.Pow2(destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).Pow2(destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.ToDouble().QuickPow2().ToUnit<R>();
-    }
-    internal static void Pow2<T, R>(this ICollection<T?> units, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.Pow2(destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Pow2(destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? item.Value.ToDouble().QuickPow2().ToUnit<R>() : null;
-    }
-
     // === IReadOnlyCollection<Length> ===
     internal static void Pow2<T, R>(this IReadOnlyCollection<T> units, Span<R> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -271,12 +234,6 @@ internal static partial class CollectionsPow2Extensions
         if (units is null) return null!;
         if (units is T[] array) return array.Pow2<T, R>();
         if (units is List<T> list) return list.Pow2<T, R>();
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.Pow2Core2(arr.Length, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -292,12 +249,6 @@ internal static partial class CollectionsPow2Extensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Pow2<T, R>();
         if (units is List<T?> list) return list.Pow2<T, R>();
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Pow2(arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();

QWERTYkez.Mensura/Extensions/CollectionsPow3Extensions.cs

@@ -175,43 +175,6 @@ internal static partial class CollectionsPow3Extensions
         return resultArray.WrapAsList<R, R>();
     }
 
-    // === ICollection<Length> ===
-    internal static void Pow3<T, R>(this ICollection<T> units, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { array.Pow3(destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).Pow3(destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.ToDouble().QuickPow3().ToUnit<R>();
-    }
-    internal static void Pow3<T, R>(this ICollection<T?> units, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.Pow3(destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Pow3(destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? item.Value.ToDouble().QuickPow3().ToUnit<R>() : null;
-    }
-
     // === IReadOnlyCollection<Length> ===
     internal static void Pow3<T, R>(this IReadOnlyCollection<T> units, Span<R> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -274,12 +237,6 @@ internal static partial class CollectionsPow3Extensions
         if (units is null) return null!;
         if (units is T[] array) return array.Pow3<T, R>();
         if (units is List<T> list) return list.Pow3<T, R>();
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.PowCore3(arr.Length, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -295,12 +252,6 @@ internal static partial class CollectionsPow3Extensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Pow3<T, R>();
         if (units is List<T?> list) return list.Pow3<T, R>();
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Pow3(arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();

QWERTYkez.Mensura/Extensions/CollectionsPowNExtensions.cs

@@ -222,43 +222,6 @@ internal static partial class CollectionsPowNExtensions
         return resultArray.WrapAsList<R, R>();
     }
 
-    // === ICollection<Length> ===
-    internal static void Pow<T, R>(this ICollection<T> units, int power, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { array.Pow(power, destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).Pow(power, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.ToDouble().QuickPow(power).ToUnit<R>();
-    }
-    internal static void Pow<T, R>(this ICollection<T?> units, int power, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.Pow(power, destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Pow(power, destination); return; }
-
-        int i = 0;
-        foreach (var item in units)
-            destination[i++] = item.HasValue
-                ? item.Value.ToDouble().QuickPow(power).ToUnit<R>() : null;
-    }
-
     // === IReadOnlyCollection<Length> ===
     internal static void Pow<T, R>(this IReadOnlyCollection<T> units, int power, Span<R> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -321,12 +284,6 @@ internal static partial class CollectionsPowNExtensions
         if (units is null) return null!;
         if (units is T[] array) return array.Pow<T, R>(power);
         if (units is List<T> list) return list.Pow<T, R>(power);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.PowCore(power, arr.Length, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -342,12 +299,6 @@ internal static partial class CollectionsPowNExtensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Pow<T, R>(power);
         if (units is List<T?> list) return list.Pow<T, R>(power);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Pow(power, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();
@@ -534,43 +485,6 @@ internal static partial class CollectionsPowNExtensions
         return result.WrapAsList<R, R>();
     }
 
-    // === ICollection<Length> ===
-    internal static void Pow<T, R>(this ICollection<T> units, double power, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { array.Pow(power, destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).Pow(power, destination); return; }
-
-        int i = 0;
-        foreach (T item in units)
-            destination[i++] = Math.Pow(item.ToDouble(), power).ToUnit<R>();
-    }
-    internal static void Pow<T, R>(this ICollection<T?> units, double power, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.Pow(power, destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Pow(power, destination); return; }
-
-        int i = 0;
-        foreach (T? item in units)
-            destination[i++] = item.HasValue
-                ? Math.Pow(item.Value.ToDouble(), power).ToUnit<R>() : null;
-    }
-
     // === IReadOnlyCollection<Length> ===
     internal static void Pow<T, R>(this IReadOnlyCollection<T> units, double power, Span<R> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -633,12 +547,6 @@ internal static partial class CollectionsPowNExtensions
         if (units is null) return null!;
         if (units is T[] array) return array.Pow<T, R>(power);
         if (units is List<T> list) return list.Pow<T, R>(power);
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.Pow(power, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -654,12 +562,6 @@ internal static partial class CollectionsPowNExtensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Pow<T, R>(power);
         if (units is List<T?> list) return list.Pow<T, R>(power);
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Pow(power, arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();

QWERTYkez.Mensura/Extensions/CollectionsRootOfCubeExtensions.cs

@@ -0,0 +1,215 @@
+using System.Runtime.Intrinsics.X86;
+
+namespace QWERTYkez.Mensura.Extensions;
+
+internal static partial class CollectionsRootOfCubeExtensions
+{
+    // === CbrtCore === SIMD
+    internal static unsafe void CbrtCore<T, R>(this ReadOnlySpan<T> units, int len, Span<R> destination)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        // Прямой каст без проверок размеров
+        ReadOnlySpan<double> srcDouble = MemoryMarshal.Cast<T, double>(units);
+        Span<double> dstDouble = MemoryMarshal.Cast<R, double>(destination);
+
+        int i = 0;
+        ref double srcRef = ref MemoryMarshal.GetReference(srcDouble);
+        ref double dstRef = ref MemoryMarshal.GetReference(dstDouble);
+
+        // 1. SIMD путь (AVX)
+        if (Avx.IsSupported && len >= 4)
+        {
+            int simdEnd = len & ~3;
+            for (; i < simdEnd; i += 4)
+            {
+                double* pSrc = (double*)Unsafe.AsPointer(ref Unsafe.Add(ref srcRef, i));
+                double* pDst = (double*)Unsafe.AsPointer(ref Unsafe.Add(ref dstRef, i));
+
+                // Используем LoadVector256 для максимально быстрой обработки 4-х double
+                Avx.Store(pDst, Avx.Sqrt(Avx.LoadVector256(pSrc)));
+            }
+        }
+        // 2. Fallback путь для остатка
+        for (; i < len; i++)
+        {
+            Unsafe.Add(ref dstRef, i) = Math.Sqrt(Unsafe.Add(ref srcRef, i));
+        }
+    }
+    internal static void CbrtCore<T, R>(this ReadOnlySpan<T?> units, int len, Span<R?> destination)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        ref var srcRef = ref MemoryMarshal.GetReference(units);
+        ref var dstRef = ref MemoryMarshal.GetReference(destination);
+        int i = 0, unrollEnd = len & ~3;
+
+        for (; i < unrollEnd; i += 4)
+        {
+            Unsafe.Add(ref dstRef, i) = Unsafe.Add(ref srcRef, i).HasValue ? Math.Sqrt(Unsafe.Add(ref srcRef, i)!.Value.ToDouble()).ToUnit<R>() : null;
+            Unsafe.Add(ref dstRef, i + 1) = Unsafe.Add(ref srcRef, i + 1).HasValue ? Math.Sqrt(Unsafe.Add(ref srcRef, i + 1)!.Value.ToDouble()).ToUnit<R>() : null;
+            Unsafe.Add(ref dstRef, i + 2) = Unsafe.Add(ref srcRef, i + 2).HasValue ? Math.Sqrt(Unsafe.Add(ref srcRef, i + 2)!.Value.ToDouble()).ToUnit<R>() : null;
+            Unsafe.Add(ref dstRef, i + 3) = Unsafe.Add(ref srcRef, i + 3).HasValue ? Math.Sqrt(Unsafe.Add(ref srcRef, i + 3)!.Value.ToDouble()).ToUnit<R>() : null;
+        }
+        for (; i < len; i++)
+            Unsafe.Add(ref dstRef, i) = Unsafe.Add(ref srcRef, i).HasValue ? Math.Sqrt(Unsafe.Add(ref srcRef, i)!.Value.ToDouble()).ToUnit<R>() : null;
+    }
+
+    // === ReadOnlySpan ===
+    internal static void Cbrt<T, R>(this ReadOnlySpan<T> units, Span<R> destination)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        if (units.IsEmpty) return;
+        int len = units.Length;
+        if (len > destination.Length)
+            throw new ArgumentException("Целевой буфер destination меньше исходного source.");
+
+        units.CbrtCore(len, destination);
+    }
+    internal static void Cbrt<T, R>(this ReadOnlySpan<T?> units, Span<R?> destination)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        if (units.IsEmpty) return;
+        int len = units.Length;
+        if (len > destination.Length)
+            throw new ArgumentException("Целевой буфер destination меньше исходного source.");
+
+        units.CbrtCore(len, destination);
+    }
+
+    // === Array ===
+    internal static R[] Cbrt<T, R>(this T[] units)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        if (units is null) return null!;
+        if (units.Length == 0) return [];
+
+        var result = new R[units.Length];
+        Cbrt(units, result);
+        return result;
+    }
+    internal static R?[] Cbrt<T, R>(this T?[] units)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        if (units is null) return null!;
+        if (units.Length == 0) return [];
+
+        var result = new R?[units.Length];
+        Cbrt(units, result);
+        return result;
+    }
+
+    // === List ===
+    internal static List<R> Cbrt<T, R>(this List<T> units)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        if (units is null) return null!;
+        int len = units.Count;
+        if (len == 0) return [];
+
+        var resultArray = new R[len];
+        Cbrt(CollectionsMarshal.AsSpan(units), resultArray);
+        return resultArray.WrapAsList<R, R>();
+    }
+    internal static List<R?> Cbrt<T, R>(this List<T?> units)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        if (units is null) return null!;
+        int len = units.Count;
+        if (len == 0) return [];
+
+        var resultArray = new R?[len];
+        Cbrt(CollectionsMarshal.AsSpan(units), resultArray);
+        return resultArray.WrapAsList<R, R>();
+    }
+
+    // === IReadOnlyCollection ===
+    internal static void Cbrt<T, R>(this IReadOnlyCollection<T> units, Span<R> destination)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        if (units is null) return;
+        int count = units.Count;
+        if (count == 0) return;
+        if (destination.Length < count) throw new ArgumentException("Destination too short");
+
+        if (units is T[] array) { array.AsSpan().CbrtCore(count, destination); return; }
+        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).CbrtCore(count, destination); return; }
+
+        int i = 0;
+        ref R dstRef = ref MemoryMarshal.GetReference(destination);
+        foreach (T item in units) Unsafe.Add(ref dstRef, i++) = Math.Sqrt(item.ToDouble()).ToUnit<R>();
+    }
+    internal static void Cbrt<T, R>(this IReadOnlyCollection<T?> units, Span<R?> destination)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        if (units is null) return;
+        int count = units.Count;
+        if (count == 0) return;
+        if (destination.Length < count)
+            throw new ArgumentException("Destination too short");
+
+        if (units is T?[] array) { array.Cbrt(destination); return; }
+        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Cbrt(destination); return; }
+
+        int i = 0;
+        foreach (T? item in units)
+            destination[i++] = item.HasValue
+                ? Math.Sqrt(item.Value.ToDouble()).ToUnit<R>() : null;
+    }
+
+    // === IEnumerable + yield ===
+    internal static IEnumerable<R> SqrtIterator3<T, R>(this IEnumerable<T> units)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        foreach (var item in units) yield return Math.Sqrt(item.ToDouble()).ToUnit<R>();
+    }
+    internal static IEnumerable<R?> SqrtNullableIterator3<T, R>(this IEnumerable<T?> units)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        foreach (var item in units)
+            yield return item.HasValue
+                ? Math.Sqrt(item.Value.ToDouble()).ToUnit<R>() : null;
+    }
+
+    // === IEnumerable ===
+    internal static IEnumerable<R> Cbrt<T, R>(this IEnumerable<T> units)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        if (units is null) return null!;
+        if (units is T[] array) return array.Cbrt<T, R>();
+        if (units is List<T> list) return list.Cbrt<T, R>();
+        if (units is IReadOnlyCollection<T> roc)
+        {
+            var arr = roc.ToArray();
+            arr.Cbrt(arr);
+            return arr.ReCast<T, R>();
+        }
+        else return SqrtIterator3<T, R>(units);
+    }
+    internal static IEnumerable<R?> Cbrt<T, R>(this IEnumerable<T?> units)
+        where T : struct, IMensuraUnit, IEquatable<T>
+        where R : struct, IMensuraUnit, IEquatable<R>
+    {
+        if (units is null) return null!;
+        if (units is T?[] array) return array.Cbrt<T, R>();
+        if (units is List<T?> list) return list.Cbrt<T, R>();
+        if (units is IReadOnlyCollection<T?> roc)
+        {
+            var arr = roc.ToArray();
+            arr.Cbrt(arr);
+            return arr.ReCast<T, R>();
+        }
+        else return SqrtNullableIterator3<T, R>(units);
+    }
+}

QWERTYkez.Mensura/Extensions/CollectionsRootOfSquareExtensions.cs

@@ -2,7 +2,7 @@
 
 namespace QWERTYkez.Mensura.Extensions;
 
-internal static partial class CollectionsSqrtExtensions
+internal static partial class CollectionsRootOfSquareExtensions
 {
     // === SqrtCore === SIMD
     internal static unsafe void SqrtCore<T, R>(this ReadOnlySpan<T> units, int len, Span<R> destination)
@@ -13,11 +13,10 @@ internal static partial class CollectionsSqrtExtensions
         Span<double> dstDouble = MemoryMarshal.Cast<R, double>(destination);
 
         int i = 0;
-
         ref double srcRef = ref MemoryMarshal.GetReference(srcDouble);
         ref double dstRef = ref MemoryMarshal.GetReference(dstDouble);
 
-        // 1. ПУТЬ AVX (x64 Процессоры Intel/AMD) — обрабатываем по 4 элемента double
+        // 1. ПУТЬ AVX2 / AVX (x64 Процессоры) — обрабатываем по 4 элемента double за такт
         if (Avx.IsSupported && len >= 4)
         {
             int simdEnd = len & ~3;
@@ -26,18 +25,16 @@ internal static partial class CollectionsSqrtExtensions
                 ref double currentSrc = ref Unsafe.Add(ref srcRef, i);
                 ref double currentDst = ref Unsafe.Add(ref dstRef, i);
 
-                // Получаем указатели через Unsafe.AsPointer
                 double* pSrc = (double*)Unsafe.AsPointer(ref currentSrc);
                 double* pDst = (double*)Unsafe.AsPointer(ref currentDst);
 
-                // Выровненная загрузка (требует, чтобы pSrc был кратен 32)
+                // Используем Load вместо LoadVector256 (Load безопасен к невыровненной по 32-байтам памяти)
                 var v = Avx.LoadVector256(pSrc);
                 var sqrtV = Avx.Sqrt(v);
-                // Выровненное сохранение
                 Avx.Store(pDst, sqrtV);
             }
         }
-        // 2. ПУТЬ VECTOR (ARM64 / Apple Silicon / Старые CPU без AVX)
+        // 2. КРОССПЛАТФОРМЕННЫЙ VECTOR (ARM64 / Apple Silicon / NEON / SIMD Fallback)
         else if (Vector.IsHardwareAccelerated && len >= Vector<double>.Count)
         {
             int vCount = Vector<double>.Count;
@@ -45,18 +42,13 @@ internal static partial class CollectionsSqrtExtensions
 
             for (; i < simdEnd; i += vCount)
             {
-                // Используем Span для кроссплатформенного создания вектора
                 var v = new Vector<double>(srcDouble.Slice(i, vCount));
-
-                // Кроссплатформенный аппаратный корень (на ARM превратится в NEON инструкцию)
                 var sqrtV = Vector.SquareRoot(v);
-
-                // Копируем напрямую в целевой Span
                 sqrtV.CopyTo(dstDouble.Slice(i, vCount));
             }
         }
 
-        // 3. Хвост массива (или обычный расчет, если SIMD на процессоре недоступен)
+        // 3. ХВОСТ МАССИВА (или работа на старых CPU)
         for (; i < len; i++)
         {
             Unsafe.Add(ref dstRef, i) = Math.Sqrt(Unsafe.Add(ref srcRef, i));
@@ -66,47 +58,41 @@ internal static partial class CollectionsSqrtExtensions
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
     {
-        // Получаем прямые ref-ссылки на начало буферов за 0 тактов процессора
         ref var srcRef = ref MemoryMarshal.GetReference(units);
         ref var dstRef = ref MemoryMarshal.GetReference(destination);
 
         int i = 0;
-        int unrollEnd = len & ~3; // Граница развернутого цикла (кратная 4)
+        int unrollEnd = len & ~3;
 
-        // 1. ОСНОВНОЙ ЦИКЛ: Конвейерная обработка по 4 элемента за итерацию
+        // ОСНОВНОЙ ЦИКЛ: Конвейерное чтение по 4 элемента (Развертка цикла повышает ILP процессора)
         for (; i < unrollEnd; i += 4)
         {
-            T? u0 = Unsafe.Add(ref srcRef, i);
+            ref readonly T? u0 = ref Unsafe.Add(ref srcRef, i);
-            T? u1 = Unsafe.Add(ref srcRef, i + 1);
+            ref readonly T? u1 = ref Unsafe.Add(ref srcRef, i + 1);
-            T? u2 = Unsafe.Add(ref srcRef, i + 2);
+            ref readonly T? u2 = ref Unsafe.Add(ref srcRef, i + 2);
-            T? u3 = Unsafe.Add(ref srcRef, i + 3);
+            ref readonly T? u3 = ref Unsafe.Add(ref srcRef, i + 3);
 
-            // Получаем ref-ссылки на целевые ячейки типа R? (zero-cost адресация)
             ref var d0 = ref Unsafe.Add(ref dstRef, i);
             ref var d1 = ref Unsafe.Add(ref dstRef, i + 1);
             ref var d2 = ref Unsafe.Add(ref dstRef, i + 2);
             ref var d3 = ref Unsafe.Add(ref dstRef, i + 3);
 
-            // Считаем нативный корень прямо в регистрах и трансформируем тип из T в R по месту
             d0 = u0.HasValue ? Math.Sqrt(u0.Value.ToDouble()).ToUnit<R>() : null;
             d1 = u1.HasValue ? Math.Sqrt(u1.Value.ToDouble()).ToUnit<R>() : null;
             d2 = u2.HasValue ? Math.Sqrt(u2.Value.ToDouble()).ToUnit<R>() : null;
             d3 = u3.HasValue ? Math.Sqrt(u3.Value.ToDouble()).ToUnit<R>() : null;
         }
 
-        // 2. ХВОСТ ЦИКЛА: Довычисляем остаток элементов (от 1 до 3 штук)
+        // ХВОСТ ЦИКЛА: Остаток элементов
         for (; i < len; i++)
         {
-            T? unit = Unsafe.Add(ref srcRef, i);
+            ref readonly T? unit = ref Unsafe.Add(ref srcRef, i);
             ref var dst = ref Unsafe.Add(ref dstRef, i);
             dst = unit.HasValue ? Math.Sqrt(unit.Value.ToDouble()).ToUnit<R>() : null;
         }
     }
 
-
+    // === ReadOnlySpan API ===
-
-
-    // === ReadOnlySpan ===
     internal static void Sqrt<T, R>(this ReadOnlySpan<T> units, Span<R> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
@@ -130,7 +116,7 @@ internal static partial class CollectionsSqrtExtensions
         units.SqrtCore(len, destination);
     }
 
-    // === Array ===
+    // === Array API ===
     internal static R[] Sqrt<T, R>(this T[] units)
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
@@ -139,7 +125,7 @@ internal static partial class CollectionsSqrtExtensions
         if (units.Length == 0) return [];
 
         var result = new R[units.Length];
-        Sqrt(units, result);
+        units.AsSpan().SqrtCore(units.Length, result.AsSpan());
         return result;
     }
     internal static R?[] Sqrt<T, R>(this T?[] units)
@@ -150,11 +136,11 @@ internal static partial class CollectionsSqrtExtensions
         if (units.Length == 0) return [];
 
         var result = new R?[units.Length];
-        Sqrt(units, result);
+        units.AsSpan().SqrtCore(units.Length, result.AsSpan());
         return result;
     }
 
-    // === List<Length> ===
+    // === List API ===
     internal static List<R> Sqrt<T, R>(this List<T> units)
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
@@ -164,7 +150,7 @@ internal static partial class CollectionsSqrtExtensions
         if (len == 0) return [];
 
         var resultArray = new R[len];
-        Sqrt(CollectionsMarshal.AsSpan(units), resultArray);
+        CollectionsMarshal.AsSpan(units).SqrtCore(len, resultArray.AsSpan());
         return resultArray.WrapAsList<R, R>();
     }
     internal static List<R?> Sqrt<T, R>(this List<T?> units)
@@ -176,48 +162,11 @@ internal static partial class CollectionsSqrtExtensions
         if (len == 0) return [];
 
         var resultArray = new R?[len];
-        Sqrt(CollectionsMarshal.AsSpan(units), resultArray);
+        CollectionsMarshal.AsSpan(units).SqrtCore(len, resultArray.AsSpan());
         return resultArray.WrapAsList<R, R>();
     }
 
-    // === ICollection<Length> ===
+    // === IReadOnlyCollection ===
-    internal static void Sqrt<T, R>(this ICollection<T> units, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { array.Sqrt(destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).Sqrt(destination); return; }
-
-        int i = 0;
-        foreach (T item in units)
-            destination[i++] = Math.Sqrt(item.ToDouble()).ToUnit<R>();
-    }
-    internal static void Sqrt<T, R>(this ICollection<T?> units, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.Sqrt(destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Sqrt(destination); return; }
-
-        int i = 0;
-        foreach (T? item in units)
-            destination[i++] = item.HasValue
-                ? Math.Sqrt(item.Value.ToDouble()).ToUnit<R>() : null;
-    }
-
-    // === IReadOnlyCollection<Length> ===
     internal static void Sqrt<T, R>(this IReadOnlyCollection<T> units, Span<R> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
@@ -228,12 +177,16 @@ internal static partial class CollectionsSqrtExtensions
         if (destination.Length < count)
             throw new ArgumentException("Destination too short");
 
-        if (units is T[] array) { array.Sqrt(destination); return; }
+        if (units is T[] array) { array.AsSpan().SqrtCore(count, destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).Sqrt(destination); return; }
+        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).SqrtCore(count, destination); return; }
 
         int i = 0;
+        ref R dstRef = ref MemoryMarshal.GetReference(destination);
         foreach (T item in units)
-            destination[i++] = Math.Sqrt(item.ToDouble()).ToUnit<R>();
+        {
+            if ((uint)i >= (uint)count) break;
+            Unsafe.Add(ref dstRef, i++) = Math.Sqrt(item.ToDouble()).ToUnit<R>();
+        }
     }
     internal static void Sqrt<T, R>(this IReadOnlyCollection<T?> units, Span<R?> destination)
         where T : struct, IMensuraUnit, IEquatable<T>
@@ -245,16 +198,20 @@ internal static partial class CollectionsSqrtExtensions
         if (destination.Length < count)
             throw new ArgumentException("Destination too short");
 
-        if (units is T?[] array) { array.Sqrt(destination); return; }
+        if (units is T?[] array) { array.AsSpan().SqrtCore(count, destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Sqrt(destination); return; }
+        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).SqrtCore(count, destination); return; }
 
         int i = 0;
+        ref R? dstRef = ref MemoryMarshal.GetReference(destination);
         foreach (T? item in units)
-            destination[i++] = item.HasValue
+        {
+            if ((uint)i >= (uint)count) break;
+            Unsafe.Add(ref dstRef, i++) = item.HasValue
                 ? Math.Sqrt(item.Value.ToDouble()).ToUnit<R>() : null;
+        }
     }
 
-    // === IEnumerable<Length> + yield ===
+    // === IEnumerable Iterators ===
     internal static IEnumerable<R> SqrtIterator<T, R>(this IEnumerable<T> units)
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
@@ -271,7 +228,7 @@ internal static partial class CollectionsSqrtExtensions
                 ? Math.Sqrt(item.Value.ToDouble()).ToUnit<R>() : null;
     }
 
-    // === IEnumerable<Length> ===
+    // === IEnumerable API ===
     internal static IEnumerable<R> Sqrt<T, R>(this IEnumerable<T> units)
         where T : struct, IMensuraUnit, IEquatable<T>
         where R : struct, IMensuraUnit, IEquatable<R>
@@ -279,12 +236,6 @@ internal static partial class CollectionsSqrtExtensions
         if (units is null) return null!;
         if (units is T[] array) return array.Sqrt<T, R>();
         if (units is List<T> list) return list.Sqrt<T, R>();
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.Sqrt(arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T> roc)
         {
             var arr = roc.ToArray();
@@ -300,12 +251,6 @@ internal static partial class CollectionsSqrtExtensions
         if (units is null) return null!;
         if (units is T?[] array) return array.Sqrt<T, R>();
         if (units is List<T?> list) return list.Sqrt<T, R>();
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Sqrt(arr);
-            return arr.ReCast<T, R>();
-        }
         if (units is IReadOnlyCollection<T?> roc)
         {
             var arr = roc.ToArray();

QWERTYkez.Mensura/Extensions/CollectionsSqrt3Extensions.cs

@@ -1,317 +0,0 @@
-using System.Runtime.Intrinsics.X86;
-
-namespace QWERTYkez.Mensura.Extensions;
-
-internal static partial class CollectionsSqrt3Extensions
-{
-    // === SqrtCore3 === SIMD
-    internal static unsafe void SqrtCore3<T, R>(this ReadOnlySpan<T> units, int len, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        ReadOnlySpan<double> srcDouble = MemoryMarshal.Cast<T, double>(units);
-        Span<double> dstDouble = MemoryMarshal.Cast<R, double>(destination);
-
-        int i = 0;
-
-        ref double srcRef = ref MemoryMarshal.GetReference(srcDouble);
-        ref double dstRef = ref MemoryMarshal.GetReference(dstDouble);
-
-        // 1. ПУТЬ AVX (x64 Процессоры Intel/AMD) — обрабатываем по 4 элемента double
-        if (Avx.IsSupported && len >= 4)
-        {
-            int simdEnd = len & ~3;
-            for (; i < simdEnd; i += 4)
-            {
-                ref double currentSrc = ref Unsafe.Add(ref srcRef, i);
-                ref double currentDst = ref Unsafe.Add(ref dstRef, i);
-
-                // Получаем указатели через Unsafe.AsPointer
-                double* pSrc = (double*)Unsafe.AsPointer(ref currentSrc);
-                double* pDst = (double*)Unsafe.AsPointer(ref currentDst);
-
-                // Выровненная загрузка (требует, чтобы pSrc был кратен 32)
-                var v = Avx.LoadVector256(pSrc);
-                var sqrtV = Avx.Sqrt(v);
-                // Выровненное сохранение
-                Avx.Store(pDst, sqrtV);
-            }
-        }
-        // 2. ПУТЬ VECTOR (ARM64 / Apple Silicon / Старые CPU без AVX)
-        else if (Vector.IsHardwareAccelerated && len >= Vector<double>.Count)
-        {
-            int vCount = Vector<double>.Count;
-            int simdEnd = len & ~(vCount - 1);
-
-            for (; i < simdEnd; i += vCount)
-            {
-                // Используем Span для кроссплатформенного создания вектора
-                var v = new Vector<double>(srcDouble.Slice(i, vCount));
-
-                // Кроссплатформенный аппаратный корень (на ARM превратится в NEON инструкцию)
-                var sqrtV = Vector.SquareRoot(v);
-
-                // Копируем напрямую в целевой Span
-                sqrtV.CopyTo(dstDouble.Slice(i, vCount));
-            }
-        }
-
-        // 3. Хвост массива (или обычный расчет, если SIMD на процессоре недоступен)
-        for (; i < len; i++)
-        {
-            Unsafe.Add(ref dstRef, i) = Math.Sqrt(Unsafe.Add(ref srcRef, i));
-        }
-    }
-    internal static void SqrtCore3<T, R>(this ReadOnlySpan<T?> units, int len, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        // Получаем прямые ref-ссылки на начало буферов за 0 тактов процессора
-        ref var srcRef = ref MemoryMarshal.GetReference(units);
-        ref var dstRef = ref MemoryMarshal.GetReference(destination);
-
-        int i = 0;
-        int unrollEnd = len & ~3; // Граница развернутого цикла (кратная 4)
-
-        // 1. ОСНОВНОЙ ЦИКЛ: Конвейерная обработка по 4 элемента за итерацию
-        for (; i < unrollEnd; i += 4)
-        {
-            T? u0 = Unsafe.Add(ref srcRef, i);
-            T? u1 = Unsafe.Add(ref srcRef, i + 1);
-            T? u2 = Unsafe.Add(ref srcRef, i + 2);
-            T? u3 = Unsafe.Add(ref srcRef, i + 3);
-
-            // Получаем ref-ссылки на целевые ячейки типа R? (zero-cost адресация)
-            ref var d0 = ref Unsafe.Add(ref dstRef, i);
-            ref var d1 = ref Unsafe.Add(ref dstRef, i + 1);
-            ref var d2 = ref Unsafe.Add(ref dstRef, i + 2);
-            ref var d3 = ref Unsafe.Add(ref dstRef, i + 3);
-
-            // Считаем нативный корень прямо в регистрах и трансформируем тип из T в R по месту
-            d0 = u0.HasValue ? Math.Sqrt(u0.Value.ToDouble()).ToUnit<R>() : null;
-            d1 = u1.HasValue ? Math.Sqrt(u1.Value.ToDouble()).ToUnit<R>() : null;
-            d2 = u2.HasValue ? Math.Sqrt(u2.Value.ToDouble()).ToUnit<R>() : null;
-            d3 = u3.HasValue ? Math.Sqrt(u3.Value.ToDouble()).ToUnit<R>() : null;
-        }
-
-        // 2. ХВОСТ ЦИКЛА: Довычисляем остаток элементов (от 1 до 3 штук)
-        for (; i < len; i++)
-        {
-            T? unit = Unsafe.Add(ref srcRef, i);
-            ref var dst = ref Unsafe.Add(ref dstRef, i);
-            dst = unit.HasValue ? Math.Sqrt(unit.Value.ToDouble()).ToUnit<R>() : null;
-        }
-    }
-
-
-
-
-    // === ReadOnlySpan ===
-    internal static void Sqrt3<T, R>(this ReadOnlySpan<T> units, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units.IsEmpty) return;
-        int len = units.Length;
-        if (len > destination.Length)
-            throw new ArgumentException("Целевой буфер destination меньше исходного source.");
-
-        units.SqrtCore3(len, destination);
-    }
-    internal static void Sqrt3<T, R>(this ReadOnlySpan<T?> units, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units.IsEmpty) return;
-        int len = units.Length;
-        if (len > destination.Length)
-            throw new ArgumentException("Целевой буфер destination меньше исходного source.");
-
-        units.SqrtCore3(len, destination);
-    }
-
-    // === Array ===
-    internal static R[] Sqrt3<T, R>(this T[] units)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return null!;
-        if (units.Length == 0) return [];
-
-        var result = new R[units.Length];
-        Sqrt3(units, result);
-        return result;
-    }
-    internal static R?[] Sqrt3<T, R>(this T?[] units)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return null!;
-        if (units.Length == 0) return [];
-
-        var result = new R?[units.Length];
-        Sqrt3(units, result);
-        return result;
-    }
-
-    // === List<Length> ===
-    internal static List<R> Sqrt3<T, R>(this List<T> units)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return null!;
-        int len = units.Count;
-        if (len == 0) return [];
-
-        var resultArray = new R[len];
-        Sqrt3(CollectionsMarshal.AsSpan(units), resultArray);
-        return resultArray.WrapAsList<R, R>();
-    }
-    internal static List<R?> Sqrt3<T, R>(this List<T?> units)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return null!;
-        int len = units.Count;
-        if (len == 0) return [];
-
-        var resultArray = new R?[len];
-        Sqrt3(CollectionsMarshal.AsSpan(units), resultArray);
-        return resultArray.WrapAsList<R, R>();
-    }
-
-    // === ICollection<Length> ===
-    internal static void Sqrt3<T, R>(this ICollection<T> units, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { array.Sqrt3(destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).Sqrt3(destination); return; }
-
-        int i = 0;
-        foreach (T item in units)
-            destination[i++] = Math.Sqrt(item.ToDouble()).ToUnit<R>();
-    }
-    internal static void Sqrt3<T, R>(this ICollection<T?> units, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.Sqrt3(destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Sqrt3(destination); return; }
-
-        int i = 0;
-        foreach (T? item in units)
-            destination[i++] = item.HasValue
-                ? Math.Sqrt(item.Value.ToDouble()).ToUnit<R>() : null;
-    }
-
-    // === IReadOnlyCollection<Length> ===
-    internal static void Sqrt3<T, R>(this IReadOnlyCollection<T> units, Span<R> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T[] array) { array.Sqrt3(destination); return; }
-        if (units is List<T> list) { CollectionsMarshal.AsSpan(list).Sqrt3(destination); return; }
-
-        int i = 0;
-        foreach (T item in units)
-            destination[i++] = Math.Sqrt(item.ToDouble()).ToUnit<R>();
-    }
-    internal static void Sqrt3<T, R>(this IReadOnlyCollection<T?> units, Span<R?> destination)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return;
-        int count = units.Count;
-        if (count == 0) return;
-        if (destination.Length < count)
-            throw new ArgumentException("Destination too short");
-
-        if (units is T?[] array) { array.Sqrt3(destination); return; }
-        if (units is List<T?> list) { CollectionsMarshal.AsSpan(list).Sqrt3(destination); return; }
-
-        int i = 0;
-        foreach (T? item in units)
-            destination[i++] = item.HasValue
-                ? Math.Sqrt(item.Value.ToDouble()).ToUnit<R>() : null;
-    }
-
-    // === IEnumerable<Length> + yield ===
-    internal static IEnumerable<R> SqrtIterator3<T, R>(this IEnumerable<T> units)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        foreach (var item in units)
-            yield return Math.Sqrt(item.ToDouble()).ToUnit<R>();
-    }
-    internal static IEnumerable<R?> SqrtNullableIterator3<T, R>(this IEnumerable<T?> units)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        foreach (var item in units)
-            yield return item.HasValue
-                ? Math.Sqrt(item.Value.ToDouble()).ToUnit<R>() : null;
-    }
-
-    // === IEnumerable<Length> ===
-    internal static IEnumerable<R> Sqrt3<T, R>(this IEnumerable<T> units)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return null!;
-        if (units is T[] array) return array.Sqrt3<T, R>();
-        if (units is List<T> list) return list.Sqrt3<T, R>();
-        if (units is ICollection<T> col)
-        {
-            var arr = col.ToArray();
-            arr.Sqrt3(arr);
-            return arr.ReCast<T, R>();
-        }
-        if (units is IReadOnlyCollection<T> roc)
-        {
-            var arr = roc.ToArray();
-            arr.Sqrt3(arr);
-            return arr.ReCast<T, R>();
-        }
-        else return SqrtIterator3<T, R>(units);
-    }
-    internal static IEnumerable<R?> Sqrt3<T, R>(this IEnumerable<T?> units)
-        where T : struct, IMensuraUnit, IEquatable<T>
-        where R : struct, IMensuraUnit, IEquatable<R>
-    {
-        if (units is null) return null!;
-        if (units is T?[] array) return array.Sqrt3<T, R>();
-        if (units is List<T?> list) return list.Sqrt3<T, R>();
-        if (units is ICollection<T?> col)
-        {
-            var arr = col.ToArray();
-            arr.Sqrt3(arr);
-            return arr.ReCast<T, R>();
-        }
-        if (units is IReadOnlyCollection<T?> roc)
-        {
-            var arr = roc.ToArray();
-            arr.Sqrt3(arr);
-            return arr.ReCast<T, R>();
-        }
-        else return SqrtNullableIterator3<T, R>(units);
-    }
-}

QWERTYkez.Mensura/Mimics.cs

@@ -1,16 +1,16 @@
 namespace QWERTYkez.Mensura;
 
 [StructLayout(LayoutKind.Sequential)]
-internal class Mimics<T>
+internal class ListMimic<T>
 {
     public T[] Items = null!;
     public int Size;
     public int Version;
 }
 
-[StructLayout(LayoutKind.Sequential)]
+[StructLayout(LayoutKind.Explicit, Size = 16)]
-internal struct NullableDoubleMimic
+public struct NullableDoubleMimic
 {
-    public double Value;
+    [FieldOffset(0)] public bool HasValue;
-    public byte HasValue;
+    [FieldOffset(8)] public double Value;
 }

QWERTYkez.Mensura/QWERTYkez.Mensura.csproj

@@ -5,7 +5,6 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <LangVersion>latest</LangVersion>
-	<GenerateAssemblyInfo>false</GenerateAssemblyInfo>
 	<GenerateTargetFrameworkAttribute>false</GenerateTargetFrameworkAttribute>
 	<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
 	<NoWarn>1701;1702;IDE1006</NoWarn>
@@ -13,8 +12,8 @@
 
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" PrivateAssets="All" />
-	  
+	<ProjectReference Include="..\QWERTYkez.Mensura.Generator\QWERTYkez.Mensura.Generator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
-	  <ProjectReference Include="..\QWERTYkez.Mensura.Generator\QWERTYkez.Mensura.Generator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
+	<InternalsVisibleTo Include="QWERTYkez.Mensura.Tests" />
   </ItemGroup>
 
 </Project>

QWERTYkez.Mensura/Units/Area.cs

@@ -61,21 +61,21 @@ public static class AreaSqrtExtension
 {
     // === ReadOnlySpan
     [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Sqrt(
-        this ReadOnlySpan<Area> units, Span<Length> destination) => units.Sqrt3<Area, Length>(destination);
+        this ReadOnlySpan<Area> units, Span<Length> destination) => units.Cbrt<Area, Length>(destination);
     [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Sqrt(
-        this ReadOnlySpan<Area?> units, Span<Length?> destination) => units.Sqrt3<Area, Length>(destination);
+        this ReadOnlySpan<Area?> units, Span<Length?> destination) => units.Cbrt<Area, Length>(destination);
 
     // === Array ===
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]public static Length[] Sqrt(this Area[] units) => units.Sqrt3<Area, Length>();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]public static Length[] Sqrt(this Area[] units) => units.Cbrt<Area, Length>();
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static Length?[] Sqrt(this Area?[] units) => units.Sqrt3<Area, Length>();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static Length?[] Sqrt(this Area?[] units) => units.Cbrt<Area, Length>();
 
     // === List<T> ===
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static List<Length> Sqrt(this List<Area> units) => units.Sqrt3<Area, Length>();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static List<Length> Sqrt(this List<Area> units) => units.Cbrt<Area, Length>();
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static List<Length?> Sqrt(this List<Area?> units) => units.Sqrt3<Area, Length>();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static List<Length?> Sqrt(this List<Area?> units) => units.Cbrt<Area, Length>();
 
     // === IEnumerable<T> ===
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static IEnumerable<Length> Sqrt(this IEnumerable<Area> units) => units.Sqrt3<Area, Length>();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static IEnumerable<Length> Sqrt(this IEnumerable<Area> units) => units.Cbrt<Area, Length>();
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static IEnumerable<Length?> Sqrt(this IEnumerable<Area?> units) => units.Sqrt3<Area, Length>();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static IEnumerable<Length?> Sqrt(this IEnumerable<Area?> units) => units.Cbrt<Area, Length>();
 }
 
 internal readonly struct AreaConv

QWERTYkez.Mensura/Units/Volume.cs

@@ -38,22 +38,22 @@ public readonly partial record struct Volume
 public static class VolumeSqrtExtension
 {
     // === ReadOnlySpan
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Sqrt3(
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Cbrt(
-        this ReadOnlySpan<Volume> units, Span<Length> destination) => units.Sqrt3<Volume, Length>(destination);
+        this ReadOnlySpan<Volume> units, Span<Length> destination) => units.Cbrt<Volume, Length>(destination);
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Sqrt3(
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Cbrt(
-        this ReadOnlySpan<Volume?> units, Span<Length?> destination) => units.Sqrt3<Volume, Length>(destination);
+        this ReadOnlySpan<Volume?> units, Span<Length?> destination) => units.Cbrt<Volume, Length>(destination);
 
     // === Array ===
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static Length[] Sqrt3(this Volume[] units) => units.Sqrt3<Volume, Length>();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static Length[] Cbrt(this Volume[] units) => units.Cbrt<Volume, Length>();
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static Length?[] Sqrt3(this Volume?[] units) => units.Sqrt3<Volume, Length>();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static Length?[] Cbrt(this Volume?[] units) => units.Cbrt<Volume, Length>();
 
     // === List<T> ===
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static List<Length> Sqrt3(this List<Volume> units) => units.Sqrt3<Volume, Length>();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static List<Length> Cbrt(this List<Volume> units) => units.Cbrt<Volume, Length>();
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static List<Length?> Sqrt3(this List<Volume?> units) => units.Sqrt3<Volume, Length>();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static List<Length?> Cbrt(this List<Volume?> units) => units.Cbrt<Volume, Length>();
 
     // === IEnumerable<T> ===
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static IEnumerable<Length> Sqrt3(this IEnumerable<Volume> units) => units.Sqrt3<Volume, Length>();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static IEnumerable<Length> Cbrt(this IEnumerable<Volume> units) => units.Cbrt<Volume, Length>();
-    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static IEnumerable<Length?> Sqrt3(this IEnumerable<Volume?> units) => units.Sqrt3<Volume, Length>();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static IEnumerable<Length?> Cbrt(this IEnumerable<Volume?> units) => units.Cbrt<Volume, Length>();
 }
 
 internal readonly struct VolumeConv

QWERTYkez.Mensura/Units/XXXXXXXX.Ref.cs

@@ -1,70 +1,70 @@
-//#if DEBUG
+#if DEBUG
-//namespace QWERTYkez.Mensura.Units;
+namespace QWERTYkez.Mensura.Units;
 
-///// <summary>
+/// <summary>
-///// Base value is MilliMeters
+/// Base value is MilliMeters
-///// </summary>
+/// </summary>
-//[DebuggerDisplay("mm = {_MilliMeters.ToString(\"0.###\")}, m = {Meters.ToString(\"0.###\")}")]
+[DebuggerDisplay("mm = {_MilliMeters.ToString(\"0.###\")}, m = {Meters.ToString(\"0.###\")}")]
-//public readonly partial record struct XXXXXXXX
+public readonly partial record struct XXXXXXXX
-//{
+{
-//    public static XXXXXXXX MilliMeter { get; } = new(1);
+    public static XXXXXXXX MilliMeter { get; } = new(1);
-//    [NotMapped, JsonIgnore, IgnoreDataMember] public double _MilliMeters { get => _Value; init => _Value = value; }
+    [NotMapped, JsonIgnore, IgnoreDataMember] public double _MilliMeters { get => _Value; init => _Value = value; }
 
 
-//    public static XXXXXXXX CentiMeter { get; } = new(XXXXXXXXConv.CentiMeters.To(1));
+    public static XXXXXXXX CentiMeter { get; } = new(XXXXXXXXConv.CentiMeters.To(1));
-//    [NotMapped, JsonIgnore, IgnoreDataMember]
+    [NotMapped, JsonIgnore, IgnoreDataMember]
-//    public double CentiMeters
+    public double CentiMeters
-//    {
+    {
-//        get => XXXXXXXXConv.CentiMeters.From(_Value);
+        get => XXXXXXXXConv.CentiMeters.From(_Value);
-//        init
+        init
-//        {
+        {
-//            _Value = XXXXXXXXConv.CentiMeters.To(value);
+            _Value = XXXXXXXXConv.CentiMeters.To(value);
-//        }
+        }
-//    }
+    }
 
-//    public static XXXXXXXX DeciMeter { get; } = new(XXXXXXXXConv.DeciMeters.To(1));
+    public static XXXXXXXX DeciMeter { get; } = new(XXXXXXXXConv.DeciMeters.To(1));
-//    [NotMapped, JsonIgnore, IgnoreDataMember]
+    [NotMapped, JsonIgnore, IgnoreDataMember]
-//    public double DeciMeters
+    public double DeciMeters
-//    {
+    {
-//        get => XXXXXXXXConv.DeciMeters.From(_Value);
+        get => XXXXXXXXConv.DeciMeters.From(_Value);
-//        init => _Value = XXXXXXXXConv.DeciMeters.To(value);
+        init => _Value = XXXXXXXXConv.DeciMeters.To(value);
-//    }
+    }
 
-//    public static XXXXXXXX Meter { get; } = new(XXXXXXXXConv.Meters.To(1));
+    public static XXXXXXXX Meter { get; } = new(XXXXXXXXConv.Meters.To(1));
-//    [NotMapped, JsonIgnore, IgnoreDataMember]
+    [NotMapped, JsonIgnore, IgnoreDataMember]
-//    public double Meters
+    public double Meters
-//    {
+    {
-//        get => XXXXXXXXConv.Meters.From(_Value);
+        get => XXXXXXXXConv.Meters.From(_Value);
-//        init => _Value = XXXXXXXXConv.Meters.To(value);
+        init => _Value = XXXXXXXXConv.Meters.To(value);
-//    }
+    }
 
-//    public static XXXXXXXX KiloMeter { get; } = new(XXXXXXXXConv.KiloMeters.To(1));
+    public static XXXXXXXX KiloMeter { get; } = new(XXXXXXXXConv.KiloMeters.To(1));
-//    [NotMapped, JsonIgnore, IgnoreDataMember]
+    [NotMapped, JsonIgnore, IgnoreDataMember]
-//    public double KiloMeters
+    public double KiloMeters
-//    {
+    {
-//        get => XXXXXXXXConv.KiloMeters.From(_Value);
+        get => XXXXXXXXConv.KiloMeters.From(_Value);
-//        init => _Value = XXXXXXXXConv.KiloMeters.To(value);
+        init => _Value = XXXXXXXXConv.KiloMeters.To(value);
-//    }
+    }
 
 
-//    public XXXXXXXX AddMilliMeters(double value) => new(_Value + value);
+    public XXXXXXXX AddMilliMeters(double value) => new(_Value + value);
-//    public XXXXXXXX AddCentiMeters(double value) => new(_Value + XXXXXXXXConv.CentiMeters.To(value));
+    public XXXXXXXX AddCentiMeters(double value) => new(_Value + XXXXXXXXConv.CentiMeters.To(value));
-//    public XXXXXXXX AddDeciMeters(double value) => new(_Value + XXXXXXXXConv.DeciMeters.To(value));
+    public XXXXXXXX AddDeciMeters(double value) => new(_Value + XXXXXXXXConv.DeciMeters.To(value));
-//    public XXXXXXXX AddMeters(double value) => new(_Value + XXXXXXXXConv.Meters.To(value));
+    public XXXXXXXX AddMeters(double value) => new(_Value + XXXXXXXXConv.Meters.To(value));
-//    public XXXXXXXX AddKiloMeters(double value) => new(_Value + XXXXXXXXConv.KiloMeters.To(value));
+    public XXXXXXXX AddKiloMeters(double value) => new(_Value + XXXXXXXXConv.KiloMeters.To(value));
-//}
+}
 
 
-//internal readonly struct XXXXXXXXConv
+internal readonly struct XXXXXXXXConv
-//{
+{
-//    private XXXXXXXXConv(double multiplicator) => this.Multiplicator = multiplicator;
+    private XXXXXXXXConv(double multiplicator) => this.Multiplicator = multiplicator;
-//    public double To(double value) => value * Multiplicator;
+    public double To(double value) => value * Multiplicator;
-//    public double From(double value) => value / Multiplicator;
+    public double From(double value) => value / Multiplicator;
-//    public double Multiplicator { get; init; }
+    public double Multiplicator { get; init; }
-//    public static XXXXXXXXConv MilliMeters { get; } = new(1);
+    public static XXXXXXXXConv MilliMeters { get; } = new(1);
-//    public static XXXXXXXXConv CentiMeters { get; } = new(10);
+    public static XXXXXXXXConv CentiMeters { get; } = new(10);
-//    public static XXXXXXXXConv DeciMeters { get; } = new(100);
+    public static XXXXXXXXConv DeciMeters { get; } = new(100);
-//    public static XXXXXXXXConv Meters { get; } = new(1000);
+    public static XXXXXXXXConv Meters { get; } = new(1000);
-//    public static XXXXXXXXConv KiloMeters { get; } = new(1000000);
+    public static XXXXXXXXConv KiloMeters { get; } = new(1000000);
-//}
+}
-//#endif
+#endif