Re: [streams] Getting errored/closed reader, Auto-releasing reader, Forcible cancel() on a stream (#297)

I see. Should we also address pipeTo() cancellation issue by the cancellable promises?

```
const p = rs.pipeTo(dest);
p.cancel();
```

or

```
const p = rs.pipeTo(dest, { ..., canceller });
canceller.cancel();
```

Wouldn't the latter be implemented adopting the revealing constructor pattern?

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