Re: [whatwg/dom] Allow subclassing of AbortController / AbortSignal (Issue #1162)

I think the only reason `new WatchSignal` throws is because `new AbortSignal` throws. Generally you can subclass web platform objects.

I guess what you need is that when you instantiate a subclass of `AbortController` you need some kind of way to override the creation of an `AbortSignal` with another subclass. Perhaps using https://blog.domenic.me/the-revealing-constructor-pattern/?

And then perhaps `AbortSignal.abort()` and `AbortSignal.timeout()` need to be able to return a subclass when used on one. I think JavaScript has some capability for that as well, but I believe that feature is not much liked.

Overall though I think your rationale is sound and I think people generally appreciated being able to do this with `EventTarget`.

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