Re: [whatwg/streams] `ReadableStreamDefaultReader.read()` return values (#1117)

> though I believe that returning done = true when there are no more chunks (keeping the stream open) may be a more intuitive design choice

When there are currently no chunks available for reading but the stream is not closed, the promise returned by `reader.read()` will remain pending until either a chunk becomes available or the stream becomes closed. This matches the semantics of the (async) [iterator protocol](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterator_protocol), so it works well together with other JavaScript APIs.

I understand that it may be desirable to inspect whether there are any chunks already available in a stream's queue. Unfortunately, there's currently no API for that...

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