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

Why does this take a buffer parameter? I thought the idea was for the underlying source author to write to `.view` and then call `.respond(bytesWritten)` when they're done.

Also, maybe default bytesWritten to view.byteLength? Or is that a footgun?

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