Re: [whatwg/streams] Readable byte stream must call pull after receiving new chunk (#877)

The proposed fix has those semantics, that's exactly what `CallPullIfNeeded` achieves. I'll submit a pull request later today that implements this fix, then you can try it out yourself.

I feel like these should be the desired semantics. It also matches with the proposed detailed description for the underlying source API in #875:
> `pull(controller)`
>
>A function that is called whenever the stream’s internal queue of chunks becomes not full, i.e. whenever the queue’s desired size becomes positive. **Generally, it will be called repeatedly until the queue reaches its high water mark** (i.e. until the desired size becomes non-positive).
>
> This function will not be called until start() successfully completes. **Additionally, it will only be called repeatedly if it enqueues at least one chunk or fulfills a BYOB request**; a no-op pull() implementation will not be continually called.

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