[whatwg/streams] Reconnecting a Stream after creating it - possible? (#1004)

Domenic said this might be a good place to ask...
I'm designing an API where I intend to use WHATWG Streams.
I have to make a choice between a model where I show the user a bunch of readable/writable/transferStreams and tell the user "connect them all", and a model where I present a connected network of streams, and tell the user "make the changes you want".

I experimented a little, and found that the code below didn't work - but I could find no obvious API to do what I wanted; once you have connected a stream, there seems to be no convenient API for reconnecting them, short of messing around with the readers and writers explicitly.

Is there something obvious I'm missing?

Thanks in advance!
```

var dest1 = new WritableStream({
  write(chunk) {
    console.log('Dest 1 got ' + chunk);
  }
});

var dest2 = new WritableStream({
  write(chunk) {
    console.log('Dest 2 got ' + chunk);
  }
});

var src = new ReadableStream({
  start(controller) {
    const producer = () => {
      controller.enqueue('chunk');
      setTimeout(producer, 1000);
    };
    setTimeout(producer, 1000);
  }
});

src.pipeTo(dest1);

const pipeTo1 = () => {
  console.log('Piping to 1');
  src.pipeTo(dest1);
}

const pipeTo2 = async () => {
  console.log('Piping to 2');
  // Here there's something missing
  src.pipeTo(dest2);
}
```

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