order async messages, provide workaround flag #1636
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Stack from ghstack (oldest at bottom):
Having async messages run in parallel by default is confusing. It used to be the fact that there would be no way to delay a message response without async behaving out of order. We now have the ability, via explicit_response_port=True, to choose to defer when to respond to a message. This lets you just create_task to parallelize message handling. This adds a workaround flag just in case we need to keep someone internally on the old behavior.
Differential Revision: D85172238
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