Turns out that Emacs docstrings have an elaborate escaping mechanism. \[foo] shows the keybinding for foo, but \=\[foo] shows \[foo] literally.
If you're a Helpful user, we now handle this correctly, *and* show handy buttons!
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One weakness of online discussion is protracted debates or arguments. What if commenting systems only allowed one comment per user?
(Assuming a robust mechanism to prevent duplicate accounts.)
Clojure provides a mechanism for early termination from reduce expressions with 'reduced': https://clojuredocs.org/clojure.core/reduced
It's unusual to see a special early termination function: most PLs only provide general control flow constructs like exceptions.