Fix ToObject inverts signed/unsigned for 8bit integer.
Fix ToObject inverts signed/unsigned for 8bit integer.

modulexcite/msgpack-cli,scopely/msgpack-cli,undeadlabs/msgpack-cli,msgpack/msgpack-cli,modulexcite/msgpack-cli,scopely/msgpack-cli,msgpack/msgpack-cli,undeadlabs/msgpack-cli