Re: [w3c/ServiceWorker] Improve handling of extend lifetime promises (#1049)

annevk commented on this pull request.



>  
+          Note: If no lifetime extension promise has been added up to this point (i.e., at the end of the task that called the event handlers), the [=ExtendableEvent/extensions allowed flag=] is immediately unset. Calling {{ExtendableEvent/waitUntil()}} in subsequent asynchronous tasks will throw.

Can't you just check the event dispatch flag or some such for that?

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