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It seems the docstring on empty? is outdated, recommending to use seq to check for emptiness, even though nowodays empty? may be much faster (on counted collections):
empty?
seq
(defn empty? "Returns true if coll has no items. To check the emptiness of a seq, please use the idiom (seq x) rather than (not (empty? x))" {:added "1.0" :static true} [coll] (if (counted? coll) (zero? (count coll)) (not (seq coll))))
The docstring says "To check the emptiness of a seq..." which is still the preferred idiom.