BinaryPack is 95% MessagePack. The protocol has been extended to support distinct string and binary types.
This library is mainly used by PeerJS to transfer objects via data channels. Bug reports and fixes are welcome, but we are unlikely to implement new features.
Inspired by: https://github.com/cuzic/MessagePack-JS
