@Override
    protected <T> void writeTo(OutputStream out, T message, Schema<T> schema) throws IOException
    {
        MsgpackIOUtil.writeTo(out, message, schema, numeric);
    }
Test msgpack with {@link Map} fields.

@author Alex Shvid
protostuff-msgpack/src/test/java/io/protostuff/MsgpackRuntimeMapTest.java