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

> I think it's the major benefit of the signal model 😢. If you want to know the outcome, that's what the observer is for.

Yes, but putting this on the *resolution of an `abort()` promise* is required to ensure the *atomicity* of this outcome. Even with mutexed synchronous getters, you can't tell if `abort()` beat the fetch's natural completion *between when you call it and when it reaches the network thread* using queries to an Observer, before *or* after.

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