Re: [whatwg/xhr] final readystatechange (readyState === 3) (#161)

It is, but there is
```
If not roughly 50ms have passed since these subsubsubsteps were last invoked, then terminate these subsubsubsteps. 
```
which allows to exit in some cases... Although Firefox does not fire the event even with 500ms  delays, and the final "progress" is fired

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