Re: [whatwg/dom] Define a 'CancellationController' and 'CancellationSignal' interface. (#434)

I was supportive of @jakearchibald getting something done specifically for fetch (since that's an established API which has been waiting on cancellation for years). But if we're going to go down the path of generalizing cancellation, I agree with @bterlson that a minimal, token-based approach in ECMAScript seems like the better route here for the long-term health of the ecosystem.

What I most want to avoid is producing _two_ general but incompatible cancellation primitives, one used by web APIs and one used in ES.

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