Re: [streams] pipe redirection (#325)

I just want to say that the more I think about this in combination with #307, the more I think redirectTo is actually kind of nice. Before each write, check `ws.redirectTo` (or its corresponding internal slot to stay unobservable). If it's set, switch to `this.pipeTo(ws.redirectTo, options)`. Kind of feels hacky, but also kind of feels extremely practical.

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