Re: [streams] [Reader] Should resolve readyPromise on getReader() call? (#258)

> Right now the contract for ready is that it only fulfills if the state is no longer "waiting". I would prefer to keep that contract if possible. So I don't think resolving it on the getReader() call is very good.

IIUC we already have waiting => waiting transition.

```
var stream = ...;
var reader = stream.getReader();
stream.ready.then(() => console.log('state becomes ' + stream.state));
reader.releaseLock();
```

The above code prints 'state becomes waiting', right?

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