Re: [streams] Should we "lock" readable streams while piping? (#241)

Hmm. So `pipeTo` actually uses `.state`, `.ready` (formerly `.wait()`), and `.closed` in addition to `.read()`. Do we need to proxy all of them? Eek, now it's starting to look like it's a whole stream object.

My original plan was for the stream to appear to be "waiting" whenever off-main-thread piping was going on. But I am not sure how to fit that into the lock design. Need to think on it more.

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