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

Promise combinators aren't going to preserve aborting either; you can mix multiple types of Promises!  A specialized CancelablePromise combinator can know how to clone/pipe, so no special work required there.

`await` can potentially know about the difference between Promises and Tasks, and clone/pipe appropriately.

There's nothing parallel-universe about this, except that if you explicitly treat them as multi-cast, you either lose aborting, or you leak capabilities.  This is inescapable, and you already ran into it with streams, so I'm unsure of why you're resisting here.

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