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

I hadn't fully appreciated the distinction between "double transfers are broken" and "double transfers are broken if you tear down the middle context". I see now that we are in the latter situation, not the former.

To properly warn developers in that case we'd need to do something complicated, like, on middle-context teardown, error all streams that are currently being passed through the context. Do you think that'd be reasonably implementable? I can think of how to spec it, but the spec isn't concerned with efficiency.

In spec-land (and implementation-land?) you can synchronously observe the state of a promise. It's something we try to avoid but this seems like a special case.

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