cljuser

Clojure’s support for non boxed math is error prone and almost unusable. It’s support for non boxed collections is bolted on. Writing code like this in Clojure is a mess.

None of which work very well, and most are completely broken. The only ones that completely work are CLJ/CLJS/CLJR's internal implementations, so you have to pull in all of Clojure just to read EDN from java, for example.

Transit is a much better choice here, but even that tends to be a bit non-idiomatic in languages like Python. That's not really the fault of Transit though, languages are just too different to have a single communication protocol work flawlessly between them all.

Because lein is bloated, breaks constantly, and is absolutely overkill if all you want is a REPL and some deps from Maven.