closeEventStreamForOwner function
Closes a subscription's built-in delivery resources during owner shutdown.
Awaits override-stream cancellation and propagates its failure, but does not wait for paused application listeners to receive buffered events or done. This does not dispatch to a subclass override of Subscribed.closeEventStream.
Implementation
Future<void> closeEventStreamForOwner(Subscribed subscribed) =>
subscribed._closeEventStream(waitForListeners: false);