Re: [whatwg/streams] Could a byte stream read directly into and out of a SAB (w/o transfer)? (#757)

If in future we'd like TextEncoderStream's `readable` side to be a byte stream then we have a conflict here. It's undesirable for user code to be able to view the encode in progress, because it may be using vector ops or other things that are browser-specific. There are probably going to be other cases of platform streams where we'd like to prevent intermediate values from being visible.

I think all solutions involve adding an extra copy when the output is a SharedArrayBuffer. The question is whether this copy becomes part of the ReadableStream machinery that is specified by a flag, or whether the underlying source has to detect that `controller.byobRequest.view` is an SAB and do the copy itself.

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