Re: [streams] Change the model for ReadableStream to have async read() (#288)

We are about to introduce a pool mechanism (or pending read ops, if you prefer async read) into ReadableByteStream. We should replicate the mechanism into ExclusiveReader and it gets more and more complex. When a user defines a custom stream, it should provide its own exclusive reader - Is it possible, given that we've had difficulty in doing that?

At the time of https://github.com/whatwg/streams/issues/241#issue-47092591, I expected that the problem was easier than it really is.


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