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

> what do you think? Would Jake's idea version (returning a promise) address your use case?

I'm not sure, lemme try to clarify. Could it be used kinda like this?

```js
var ac = new AbortController();
var pr = abortableTask(ac.signal,async (setOnAbort) => {
   setOnAbort(() => "aborted!");
});

pr.then(msg => console.log(msg));

ac.abort();
// aborted!
```

Am I understanding it correctly?

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