unexpected behavior of clojure.core/empty

[Brian Craft]

=> (empty [:foo 5])
[]
=> (first (mapv identity {:foo 5}))
[:foo 5]
=> (empty (first (mapv identity {:foo 5})))
nil

What just happened there? Is this expected? In the second and third cases 
the type of the vector is clojure.lang.MapEntry, which I expect is the root 
of the behavior, but this seems very inconsistent. Is there a way to get 
the behavior one would expect? Should clojure.core/empty be avoided?

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