There's definitely some things you learn from mistakes when using a REPL workflow in Clojure or Python, where you debug for a bit and then realize that you jus

There's definitely some things you learn from mistakes when using a REPL workflow in Clojure or Python, where you debug for a bit and then realize that you just didn't reload or reinitialize something. I feel most people end up adding it to the set of things to sanity check when hitting "can't happen" situations, like "let's add a debug print here to make sure my code change is actually invoked". But that's just a backstop of course, you mainly use other practices in your REPL workflow to keep from hitting it.