Re: [streams] Reader fixups (#262)

> @@ -558,8 +558,13 @@ Instances of <code>ReadableStream</code> are created with the internal slots des
>  </div>
>  
>  <ol>
> -  <li> If <b>this</b>@\[[reader]] is not <b>undefined</b>, return <b>this</b>@\[[reader]]@\[[lockReleased]].
> -  <li> Return <b>this</b>@\[[readyPromise]].
> +  <li> If <b>this</b>@\[[readableStreamReader]] is not <b>undefined</b>, return the result of transforming
> +    <b>this</b>@\[[readableStreamReader]]@\[[lockReleased]] by a fulfillment handler that returns <b>this</b>@\[[readyPromise]].
> +  <li> Return the result of transforming <b>this</b>@\[[readyPromise]] by the following fulfillment handler:
> +    <ol>
> +      <li> If <b>this</b>@\[[readableStreamReader]] is <b>undefined</b>, return <b>undefined</b>.
> +      <li> Otherwise, return <b>this</b>@\[[readableStreamReader]]@\[[lockReleased]].
> +    </ol>

Oh, I see. I thought that introduces waiting -> waiting transition, but it is a harmless one, because some data are enqueued and a reader pulls all of them. Once I talked with @tyoshino about it and agreed we cannot avoid that kind of waiting -> waiting transition.

Thank you!

```
// stream is not locked.
stream.ready.then(() => console.log(stream.state));
reader = stream.getReader();
...
// Some items are enqueued, and reader pulls all of them.
...
reader.releaseLock();
```

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https://github.com/whatwg/streams/pull/262/files#r22993414