fix(pubsub): move flow control release to callback completion #9311
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This moves the flow control release to the end of the user callback rather than to the message
doneFunc
. This further emphasizes the importance of callingack
andnack
within the callback, since callingack
in a goroutine could mean that flow control resources are released too early. This behavior is already documentedFixes #9309
Internal issue: 322090131