This reminds me of http://4clojure.com http://4clojure.com with a simpler [nicer?] (but less featureful) UI. I want to add a slightly off-topic remark, but 4cl

This reminds me of http://4clojure.com http://4clojure.com with a simpler [nicer?] (but less featureful) UI. I want to add a slightly off-topic remark, but 4clojure actually runs the tests in a sandbox on the server. This is compiling to ClojureScript, and I have to wonder if it's "good enough" or whether down the line some koans might run into problems being ClojureScript instead of the real Clojure on the JVM.