Since we are rather new to D, would anyone be interested in helping us a bit out making such a library? We can probably do the coding ourselves, but might need some tips about how to pack it nicely into a D library which can be used with Dub etc.
Be sure to look at how MsgPack is implemented in D: https://github.com/msgpack/msgpack-dIt has a very easy interface, and is one of the better D library out there.