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

Sorry, I'm still a bit confused... 

If the `read()` method returns `done=true` when there are no more chunks _and_ the stream is closed will the `readAllchunks(readableStream)` function  in the streams spec (reproduced below) return `chunks` only if the stream is cancelled (which executes a stream close)? Or the reader is cancelled? Will it ever return chunks? 

```js
function readAllChunks(readableStream) {
  const reader = readableStream.getReader();
  const chunks = [];

  return pump();

  function pump() {
    return reader.read().then(({ value, done }) => {
      if (done) {
        return chunks;
      }

      chunks.push(value);
      return pump();
    });
  }
}
```

This is especially confusing since the documentation states that no other consumer can cancel the stream:

> Note how the first thing it does is obtain a reader, and from then on it uses the reader exclusively. This ensures that no other consumer can interfere with the stream, either by reading chunks or by canceling the stream.

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