Re: [streams] Expose the pending pullInto request via byobRequest getter than passing as an argument of pullInto (f6a4974)

This is to pass the transferred ArrayBuffer back in case the underlying source has transferred the given ArrayBuffer and therefore the ArrayBuffer initially given by the consumer of the ReadableStream is no longer valid.

> default bytesWritten to view.byteLength

Oh, interesting. Hmm, I'm slightly inclined to ask users to specify it explicitly.

BTW, I've added NaN/Infinity/Negative check on this.

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