Revisiting 'Clojure Don'ts : concat

Nostalgia City I've recently started maintaining a Clojure codebase that hasn't been touched for over a decade - all Clojure devs that built and maintained it are long gone. It's using java8, Clojure 1.6 and libs like korma and noir - remember those? Contrary to the prevailing Clojure lore, upgrading Clojure will not be just a matter of changing version numbers in the lein project.clj. I find one…