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> 
> This is the only case that will have the problem of loosing the RPC call reply. We cannot listen on two queues for the response since we want NEW(fast) to be fast.
> NEW(fast)->OLD
> 


Precisely my point. Why does it have to be fast? If the only reason to shun compatibility is performance, lets take the performance bite - by default. The configuration setting can then just be a toggle that breaks NEW(fast)->OLD and restores the performance gains.

Regards,
Eric Windisch