Re: [whatwg/dom] Encourage use of AbortError for cancellation? (#927)

I think Domenic's (also interesting) suggestion is the inverse of this one.

Jake is suggesting a way for signals to "throw if cancelled" and Domenic is suggesting a way for consumers to filter out cancellations as not exceptional in cases.

Both seem useful to me in their own right.

Worth mentioning that for Node it would be more convenient if the method Domenic is proposing was on `AbortController` or `AbortSignal` and not on `DOMException` since we can't guarantee internal methods will always throw `DOMException`s and DOMException isn't exposed as a global.


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