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Clojure alleviates this to a great extent by automatically namespace-qualifying symbols within quasiquoted forms, which prevents clashes between let-bound symbols (which are never qualified) and ones from the global scope.

It’s still possible to shoot yourself in the foot (see https://blog.danieljanus.pl/2020/01/21/middleware/ for my personal story), but for that you need `binding`, `with-redefs` or `alter-var-root`, which are all relatively rarely seen.

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This is a good example of why dynamic vars are dangerous. They are just as perilous as global state, but are more surprising and more difficult to understand. Prefer passing explicit arguments in all cases. You don't have to even think about the behavior, and you'll never spend 8 hours tracking down a missing binding in a commit from 2018.

Time flies by when writing clojure on a train?

In case anybody's wondering what the heck I meant here, it's a reference to the song Time Flies By from Half Man Half Biscuit whose lyrics the title of the linked blog post also appears to be referencing.

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