Re: [streams] Support reading bytes into buffers allocated by user code on platforms where only async read is available (#253)

It's possible to provide a predicate`isEos(value)`. It returns `value === this.EOS` in ReadableStream and returns `value.length === 0` in ReadableByteStream.

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https://github.com/whatwg/streams/issues/253#issuecomment-77483552