Re: [whatwg/streams] can streams be transferred via postMessage()? (#276)

> Also, the mere fact that we were waiting for backpressure is actually part of the stream's state, so we need to somehow transfer that as well. We could keep a boolean flag to indicate whether there is backpressure or not, send that flag when transferring the stream, and use that when we transfer-receive the stream to initialize backpressurePromise to either a pending or a resolved promise.

I didn't think of that. It seems doable, but ugly.

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