Re: [whatwg/streams] piping issue (#509)

I don't think this is pipeTo-specific. It's what always happens when the `.closed` promise is rejected, which happens when you do `reader.releaseLock()`. It happens twice for writer because it sets both `.closed` and `.ready` to rejected.

    new ReadableStream().getReader().releaseLock();
    new WritableStream().getWriter().releaseLock();

The promises would have to be lazily rejected in `get closed()` to avoid the warnings, wouldn't they?

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