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Reproduce:
(def ^:const ccc 1) (case 1 ccc :yes :no) (case 1 ccc :yes :hmm :hmm :no)
Second example yields :no because it falls back to {{cond}} which doesn't handle the consts properly.
Comment made by: hiredman
a related thread https://groups.google.com/d/msg/clojure/u1RZsmjbQ64/p7B9eRwuAQAJ
clojurescript's handling of symbols in case is broken(it diverges from clojure's), but the cond fallback is correct(it matches clojure)
Comment made by: dnolen
As discussed in that thread we're not re-breaking a thing we broke 2 years ago. It's simply not that important and far too late.