I am returning to CodinGames after a bit of a hiatus. I now develop professionally in Clojure.
I have invited some of my team members to complete a multiplayer competition with me, but was disappointed to find out that CodinGame only supports a fairly outdated version of Clojure. I am sure they will encounter frustration with the same thing.
Would it be possible to switch to use the latest stable version of Clojure, 1.8? https://clojure.github.io/clojure/clojure.core-api.html
Clojure being a relatively young language, they have added a lot of great quality of life features and functionality that makes the more recent versions far more enjoyable to program in. Clojure has excellent backwards compatibility. I'm not aware of anything that would break by updating to a newer version of the language.