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

> @@ -46,14 +48,27 @@ export default class ReadableStream {
>    }
>  
>    get closed() {
> +    if (this._reader !== undefined) {
> +      return this._reader._lockReleased.then(() => this._closedPromise);

Another reader can be acquired after the release, so

``
return this._reader._lockReleased.then(() => this.closed);
``

seems better.


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