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

> when a new chunk arrives before 50ms passes since the last chunk for that we dispatched a "progress" event, we schedule dispatching of a "progress" event after the 50ms passes.

This is important. I don't think the spec intends to discard throttled events.

Also, does fetch/readablestreams do any similar throttling? If not, I am curious why or how useful it is to spec out such a behavior for xhr.

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