Re: [streams] New proposal for byte stream uses cases (#289)

>> Does wait() call required for each read() even for object stream or it'll be just like the old ReadableStream where it's just a kicking switch of pulling.

> I think more like the latter. In this way a ReadableByteStream is like a ReadableStream with HWM = 0 that always respects backpressure and doesn't proactively fill up the queue.

- Calling wait() many times has virtually no performance penalty on ReadableStream.
- Calling wait() allocates a buffer on ReadableByteStream.

Are these correct? If so, I'm not sure if a user code expecting ReadableStream can work with ReadableByteStream - It may consume unnecessarily large memory.

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