Re: [whatwg/fetch] WIP: Cancelation (#523)

I chatted a bit with Honza Bambas about Firefox's implementation. There's indeed phases. And any kind of work that would be considered "blocking" (I/O) is done during asynchronous calls (so the code can continue to receive cancel requests).

Refactoring Fetch to take that into account might be quite a bit of work though as it would effectively need its own event loop of sorts.

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