I've done quite a bit of work with CBOR. I took a quick look over the Message Pack spec and found it a bit wanting. The CBOR encoding is more consistent and it

I've done quite a bit of work with CBOR. I took a quick look over the Message Pack spec and found it a bit wanting. The CBOR encoding is more consistent and it allows one to easily define extensions (up to 2^64 worth http://www.iana.org/assignments/cbor-tags/cbor-tags.xhtml http://www.iana.org/assignments/cbor-tags/cbor-tags.xhtml). One defined extension allows you to define references, which I found useful in encoding Lua tables.