Re: [whatwg/dom] Expose an `aborted` promise on AbortSignal? (#946)

> 1. Your example has `if (this.aborted) throw new DOMException('', 'AbortError');` where ours would be `return Promise.reject(new DOMException(...)` on the first line. In other words, our `race` always returns a promise

My bad. It should have been an async promise to enforce that. I've updated my implementation.

> everywhere you’d have written `await x` becomes `await signal.race(x)` unless `x` itself consumes the signal”.

That's a good way to think of it.

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