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Also. InvocationResponse is really only useful when going across network boundaries as 
there needs to be a way to piggyback metadata as well as propagating the return value 
or exception.





This is not true. Moving a request across thread pools and service layers also 
requires that you do not maintain the strict direct call stack semantic. Routing 
choices and exception handling can be affected by metadata associated with the 
response. Also, having to choose how the return value/exception are propagated 
depending on whether or not there is a transport layer is a complexity that does not 
need to show up if there is an InvocationResponse.


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