Re: [ServiceWorker] Returning a FetchPromise from fetch() (#625)

Consider please this example:
```javascript
var a  = fetch(...);
var b = fetch(...);
var c = fetch(...);

var req = Promise.all([a, b, c]);

req.then(function() {
  // handle load something
});

onEscPressed(function() {
  req.abort();
});
```

Here is 3 request, for example, made one one user action. Let's say it's dialog. I as a developer sometimes want to controls such request as a one. So for this case I would to use ```Promise.all``` to wait all request or to abort all in one when dialog becomes closed. So, here is the questions:
* Will ```Promise.all``` case those promises to generic ```Promise```? If so, what thing developers should use, ```FetchPromise.all```?
* Will ```req.abort()``` cancel all ```fetch``` promises? What will happen if one of them will be generic-non-cancelable promise?

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Reply to this email directly or view it on GitHub:
https://github.com/slightlyoff/ServiceWorker/issues/625#issuecomment-76017059