Re: [streams] WIP: exclusive reader interface (#251)

> @@ -517,9 +538,13 @@ Instances of <code>ReadableStream</code> are created with the internal slots des
>  <div class="note">
>    The <code>closed</code> getter returns a promise that will be fulfilled when the stream becomes closed, or rejected
>    if it ever errors.
> +
> +  If the stream is <a>locked to a reader</a>, neither of these will occur until the reader releases its lock.

The comment was mine, but it was wrong, because it doesn't work with the second example.

```
return this@[[closedPromise]].then((x) => this._reader ? this._reader._lockReleased.then(() => x): x);
```

is better, I think?


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