When I needed this functionality inside of jOOQ, I haven't found anything like it, so I rolled my own Open Source library that I call jOOU (U for Unsigned):
http://github.com/jOOQ/jOOU
I understand that some may think this is overkill, but I'd really like to have precisely those wrappers wrapping what other languages call ubyte, ushort, uint, ulong. Hopefully with Valhalla, those wrappers can be turned into value types.
Of course, contributions to the arithmetics / bitwise operation implementations are very welcome!
