jruby: unpacker symbolize keys
jruby: unpacker symbolize keys

msgpack/msgpack-ruby,cosmo0920/msgpack-ruby,cosmo0920/msgpack-ruby,cosmo0920/msgpack-ruby,ojundt/msgpack-ruby,msgpack/msgpack-ruby,ojundt/msgpack-ruby,okkez/msgpack-ruby,msgpack/msgpack-ruby,ojundt/msgpack-ruby,okkez/msgpack-ruby,cosmo0920/msgpack-ruby,ojundt/msgpack-ruby,okkez/msgpack-ruby,okkez/msgpack-ruby