It's really neat to be able to empirically verify this. If you watch Rich Hickey's talks, especially Spec-ulation, you'll see this deep commitment to compatibil

It's really neat to be able to empirically verify this. If you watch Rich Hickey's talks, especially Spec-ulation, you'll see this deep commitment to compatibility and progress through growth. This is exemplified by Clojure itself (which unlike many languages is famously "just a library") and many times in third party work. If you find a ten year old Python library, it's unlikely to work verbatim. A ten year old Clojure library is probably still idiomatic. This also works in the other direction. People regularly run RCs and alphas for Clojure itself in production. Unless you're doing something pretty novel and experimental, like, say, GraalVM native images (where manually rejiggering is common in every environment, and Clojure is no exception), odds are everything Just Works.