Re: [fetch] Aborting a fetch (#27)

@petkaantonov then you can overload .then() to do what you want, and we should be done. ;-)

Trying to prevent footguns is different from preventing holdups. How much I trust `foo` is up to me, but that's no reason to break down guarantees further, and why immutable promises is a good thing. The system should help `foo` behave, not put out trip wires.

This example is perhaps better, so thanks for pointing that out:

    var p = fetch(url);
    p.then(() => foo());
    p.cancel(); // Will this cancel the fetch? Depends on what foo does!


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