@Override
            public void writeTo(Output output, Bar message) throws IOException
            {
                output.writeObject(10, baz, Baz.getSchema(), false);
                super.writeTo(output, message);
            }
Foo shares field numbers (and type) with Bar except that foo's fields are all repeated (w/c is alright). Bar also
shares the same field and type (1&2) with Baz.
protostuff-core/src/test/java/io/protostuff/SerDeserTest.java