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

I don't have strong feeling about my version vs @Jamesernator's. It avoids the callback pattern mine has, which is good if we think my callback pattern is a bit weird. It might not be clear to devs that the inner signal behaves differently to the outer signal. In @Jamesernator's solution it's slightly harder to change the abort tasks mid-way through the task, but I don't know if that's common (it didn't come up in the examples so far).

@getify Your example looks pretty weird and I'm not sure what it's trying to achieve. It looks like it creates a strong 1:1 association between signal and task. If that's the case, I don't think we should over-index on this example, since signals tend to span multiple tasks.

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