Re: [whatwg/dom] AbortController.prototype.timeout and AbortController.prototype.cancel (Issue #1039)

> It sounds like it might be easier to allow "this's signal" to be undefined if no init.signal was provided. I'm not entirely sure why every request must have a signal, most other specs perform an "if signal is present" or "if signal is not null" check first. Maybe we should change this in Fetch?

That would work in theory but given that it's currently always expected, changing that to `undefined` in certain cases would be a breaking change that I don't know if we can get away with.

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