Re: [whatwg/streams] WritableStreamDefaultWriterGetDesiredSize(writer) cannot in general be used to determine size of chunks read by pipeTo (#938)

Hmm. I'm not sure this is so nonsensical. The whole piping/backpressure infrastructure basically relies on matching notions of "size" across the pipe. Or if not relies, at least assumes.

So the intention of this, from what I can tell, is: the writer says it wants 1024 Xs. We normally don't know how to get 1024 Xs; we just read one chunk, measure the size, and see how many Xs we got, then adjust as we go along. But if you're piping a readable byte stream to something that says it wants 1024 Xs, let's assume X is "bytes", and then we can ask the readable byte stream for exactly 1024 of those.

Seems OK?

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