Re: [whatwg/streams] Various fixes for readable byte streams (#1123)

@MattiasBuelens commented on this pull request.



>   1. If |view|.\[[ViewedArrayBuffer]].\[[ArrayBufferByteLength]] is 0, throw a {{TypeError}}
     exception.

Hmm, I suppose this check is now made redundant by this check in `ReadableByteStreamControllerRespondWithNewView`:
> 4. If firstDescriptor’s buffer byte length is not view.[[ViewedArrayBuffer]].[[ByteLength]], throw a RangeError exception.

...given that a pull-into's buffer can never be zero length.

I guess we can delete this?

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