public static FixedBits <BitVector64, ulong> ToFixedBits(this ulong src) => FixedBits.FromScalar(src);
public static FixedBits <BitVector16, ushort> ToFixedBits(this ushort src) => FixedBits.FromScalar(src);
public static FixedBits <BitVector32, uint> ToFixedBits(this uint src) => FixedBits.FromScalar(src);
public static FixedBits <BitVector8, byte> ToFixedBits(this byte src) => FixedBits.FromScalar(src);