What happens here?

> (send-off (agent {}) 
      (fn [_] 
          (clojure.tools.namespace.repl/refresh)))
> @(atom {})
=> {}
> (def s (atom {}))
=> #'user/s
> s
=> #object[clojure.lang.Atom 0x5f6a0fab {:status :ready, :val {}}]
> @s
=> ClassCastException clojure.lang.Var$Unbound cannot be cast to 
java.util.concurrent.Future  clojure.core/deref-future (core.clj:2206)

Same with agent 
> (def a (agent {}))
> @s
=> ClassCastException clojure.lang.Var$Unbound cannot be cast to 
java.util.concurrent.Future  clojure.core/deref-future (core.clj:2206)


PS: BTW atomic code reload is biggest missing feature in Clojure.

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