Re: [whatwg/fetch] Aborting a fetch: The Next Generation (#447)

> Would I get response progress events from both event.fetchObserver and observer?

Yes, but you probably wouldn't be subscribing to both sets of events - you'd either be listening to the client's view of the fetch (the `event.fetchObserver`), or the ServiceWorker's view of the fetch (the one that's attached to the call to `fetch`). There *is* a distinction, ie. if I'm choosing to make a fetch within a `fetch` event handler and then modify the response that I'm piping back to the client (ie. the outside caller that initiated the event in the ServiceWorker).

[As I noted above](https://github.com/whatwg/fetch/issues/447#issuecomment-270633873), I'm not against the idea of ServiceWorker events having a different kind of observer - as they are, again, *fundamentally different kinds of observation* - but I don't think it should be a merely *limited version of the other kind of observer*.

> If I get a push, does that appear in both?

I think `push` would be its own ServiceWorker event, similar to `fetch`: in other words, it would look largely like a `fetch`, but one initiated by the *server*.

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