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XREADGROUPhas returned and the messages are processed. These callbacks are called as follows:
call(OnBroadCast, +Redis, +Stream, +MessageId, +Dict) call(OnIdle, +Redis, +Streams, +Starts, +NewStarts, +Options)
Both callbacks must succeeds and not leave any open choice points. Failure or exception causes xlisten/5 to stop.