Re: [whatwg/streams] Permitting transferable stream optimisation (#1124)

> In the case where both ends are transferred into different contexts, it would seem a bit odd if the lifetime of the tunnel depends on the place of creation ...

I think we need to be careful to distinguish semantics from optimizations. It looks like only one end is semantically transferred in streams. That means that an unoptimized user agent would have no choice but to terminate when the place of creation seizes to exist. Since optimizations are optional, I think it follows that any optimized user agent would be required to not break those semantics, for web compatibility.

The alternative would be to require all user agents to perform the optimization, at which point it is no longer an optimization, but a change in semantics, and we should specify that.



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