If this library is supporting a newer version of the spec it should document if it supports compatibility mode with the old spec and how to use that:
excerpt from https://github.com/msgpack/msgpack/blob/master/spec.md
"In a major release, serializers distinguish Binary type and String type using bin format family and str format family
At the same time, serializers should offer "compatibility mode" which doesn't use bin format family and str 8 format"
If this library is supporting a newer version of the spec it should document if it supports compatibility mode with the old spec and how to use that:
excerpt from https://github.com/msgpack/msgpack/blob/master/spec.md
"In a major release, serializers distinguish Binary type and String type using bin format family and str format family
At the same time, serializers should offer "compatibility mode" which doesn't use bin format family and str 8 format"