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What would you need those for? For checking exhaustive type switches? Seems like an extra keyword on "interface" would do the trick.

Is this comment meant for this article? I can't for the life of me grok what you mean!

Guessing it was meant to go on https://news.ycombinator.com/item?id=30205232 ? No idea how it ended up here

Completely true. How it got here, no idea.

We'll move it. Thanks!