Re: [w3c/ServiceWorker] async waitUntil() does not allow extension on final promise resolution? (#1039)

Related(?):
I've been trying to use ```.waitUntil()``` with the ```push``` event to make sure things get done before the SW stops, basically:
```
self.addEventListener('push', evt => {
    evt.waitUntil(handlePush(evt.data));
    //or alternatively just: handlePush(evt.data);
}
```
where ```handlePush``` returns a promise that is resolved when done. I could not determine any prolonged run time with ```evt.waitUntil```. 
Is it specified anywhere what events should change the run time of the SW if used with ```waitUntil```? It is clear for that ```install``` and ```activate``` things change with ```waitUntil```, and there is something said about fetched, but what is the story beyond that?


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