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I am a little confused by the clojure instance? function. It seems quite happy to take a single argument. So
(instance? String)
works fine, but always returns false.
Am I missing something here? I've done this twice in two days, and both times it took me a quite a long time to debug (yes, I agree, to make the mistake once might be regarded as misfortune, but twice looks like carelessness).
Why doesn't it break, with an arity error?
Note added later: As of Clojure 1.6 this has been fixed!