Raymond, I'm glad you asked ;)
This is local as in "same-JVM", but we still have paths through this code with remotable interfaces that need the PBV semantics. Before my TUSCANY-3894 code, we simply used Mediator.copyXXX. The solution only worked if client & service both used the same databinding. Since this would probably be the case most of the time... I didn't want to argue too strongly that we must switch to the WSDL/XML binding in case the consensus was that this was a useful thing to optimize for... but I do think we need the ability to plugin the XML/WSDL support easily. I also didn't want to repeat the PBR calculation which is embedded within the local binding.
