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

It seems we can avoid most the issues if we just make it so you can postMessage() the stream, but not the reader.  When you postMessage() the stream then it locks the stream and transfers the underlying source.  This doesn't give 3rd party js any surface area to override as far as I can tell.

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https://github.com/whatwg/streams/issues/276#issuecomment-90238722