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

> those in ES6 with non cancelable promises

(IIUC) This is precisely what @jakearchibald was originally saying when you objected. He was saying that we cannot add `cancel()` directly to core Promises since it presents the chaos mentioned. At best it would have to be a different (subclass) CancelablePromise, such that existing systems would not be affected.

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