Is there a way to add custom type by myself? For example, uuid

Hey! Thanks for the work!

I cannot figure out the right way to add custom type. msgpack-python supports ext type by ext_hook and default arguments to Packer and Unpacker, but we cannot pass them through tarantool connection. Am I wrong?

It seems, you are right. I would make it extensible, more or less in the spirit of PR #154 or PR #190. I'll consider this issue as the feature request.