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

> You can forget to remove the listener correctly when the resource is finished and leak memory.

Just to clarify, the resource only stays in memory until `signal` is GC'd, at which point [it's all collected](https://jakearchibald.com/2020/events-and-gc/).

> One alternative suggested was to have a utility method that helps with this, the above code bemes:
> 
> ```js
> // the second parameter is so the listener is removed when the resource gets GCd. 
> aborted(signal, resource).then(() => resource.cleanup());
> ```

What mechanism is it using for that? Weakrefs?

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