Re: [whatwg/streams] "If stream.[[readableStreamController]] is not u..." (#543)

> ReadableStreamDefaultController is not exported, so it can only be constructed from within the spec.

You can get it though:

```js
let ReadableStreamDefaultController;
new ReadableStream({
  start(c) {
    ReadableStreamDefaultController = c.constructor;
  }
});

new ReadableStreamDefaultController({});
```

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