Thanks, @mattrips. I probably should have called it out more explicitly. If you're not worn out from reading, Backwards-deployable Conformances also talks about how to tackles some of the problems in Retroactive Conformances vs. Swift-in-the-OS, but focusing on libraries shipped with Apple OSs. It's less relevant to the current discussion, but I don't want to leave the impression that there's been no progress on the issues I/we raised originally.
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