Hmm ... are you sure about that? In most cases both should match. A mismatch between them might indicate a higher-level logic error. I think this will end up being a useful check, it does provide additional information about what's going on to the programmer. And in most circumstances, both numbers should match anyway, particularly with the [change below](https://github.com/rosjava/rosjava_extras/pull/8/files#diff-70f297df9af906d04895bea05968788fR265)