sequence(clojure.core)

Coerces coll to a (possibly empty) sequence, if it is not already one. Will not force a lazy seq. (sequence nil) yields ()

; clojure/core.clj:1452
(defn sequence
  [coll]
   (cond 
    (seq? coll) coll
    (stream? coll) (.sequence #^clojure.lang.Stream coll)
    :else (or (seq coll) ())))

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