Re: [whatwg/xhr] Kill the progress event when readyState is 4 (#72)

>This is guaranteed by https://fetch.spec.whatwg.org/#read-a-request as far as I can tell.

Sure. My concern is just that implementations may not get this right, as Fetch is a relatively new spec and they may not even be using it for their XHR implementations. It might therefore be worth adding notes about this invariant in the XHR spec just to make it clear that's the intent (along with the tests confirming it, just in case). It's minor enough that I'm not going to push for its inclusion, though.

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