defaults are a different thing to nil punning So nil will have had special consideration in Clojure core functions That doesn't mean it doesn't crash either i

defaults are a different thing to nil punning So nil will have had special consideration in Clojure core functions That doesn't mean it doesn't crash either it will absolutely be unhappy with nils in your math nil is usually unexpected in test outputs or at the very least an unhappy path In terms of debugging that's why I can't quit this language flowstorm let's me visually step through what happened line by line, backwards, forwards, programmatically - whatever Languages should be competing against each other by their best time travel debugger it just completely removes the need for guesswork