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(defn unconj [coll]
(when (seq coll)
(let [x ((if (vector? coll) peek first) coll)]
(list? coll) (rest coll)
(vector? coll) (subvec coll 0 (dec (count coll)))
(set? coll) (disj coll x)
(map? coll) (dissoc coll (x 0)))
;; forall coll, (seq coll) => (= (apply conj (unconj coll)) coll)
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