[whatwg/streams] Closing the controller with a pipe (#606)

I was wondering, why does closing a controller raise a TypeError? (https://streams.spec.whatwg.org/#rs-default-controller-close)

For example, I have something like that:
```
new ReadableStream({
  start(controller) {
    controller.enqueue(whatever);
    controller.close();
  }
}).pipeThrough(transform).pipeTo(writable)
```

I get a bunch of `Uncaught (in promise) TypeError: Writer was released and can no longer be used to monitor the stream's closedness` (4 Writer was released, 2 Reader was released)

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