Hi,

To avoid peeking same element of a queue, I think PersistentQueue must
be stored in ref not atom.
Is this correct?

;;Ref: safe
(dosync
  (let [item (peek @r)]
    (alter r pop)
    item))

;Atom: unsafe
(let [item (peek @a)]
  (swap! a pop)
  item))

Thanks.

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