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Conj'ing a deque onto a set causes ClassCastException

1

```clojure (require '[data.deque :as dq]) (conj [] (dq/deque 1)) ;;=> [] (conj #{} (dq/deque 1)) ;;=> Unhandled java.lang.ClassCastException ;; data.deque.PersistentDeque cannot be cast to java.lang.Iterable ``` core.clj: 5186 clojure.core/hash-ordered-coll core.clj:...