I haven’t spend that much time on thinking about the implications, but at first 
sight, it sounds like a sensible idea — maybe even more useful than switch 
(whose behavior could be mimicked).
But switch is established, and I don’t see a realistic chance to either replace 
it or add a construct that is quite similar.
Afaics, it will already be hard to collect feedback, so it might be a good idea 
to delay the pitch until the move to Discourse is done.
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