Re: [streams] [WIP] Putting a chunk back in the readable stream queue (#275)

One more point to consider about `.peek()` is that if the underlying byte source doesn't support precise flow-control, we cannot peek data from the source without draining data. E.g. we need to `read(2)` from a socket to build an ArrayBuffer for `.peek()`, and the `read(2)` would replenish the TCP window.

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