public static Span128 <T> Load <T>(ReadOnlySpan <T> src, int offset = 0) where T : struct => Span128 <T> .Load(src, offset);
public static Span128 <byte> From <T>(Span128 <T> src) where T : struct => Span128.Load(MemoryMarshal.AsBytes(src.Unblock()));
public static Span128 <T> FromParts <T>(params T[] src) where T : struct => Span128 <T> .Load(src);