It turns out that this code works in Clojure:

  (let [x (clojure.lang.Box. 1)] (set! (.val x) 2) (.val x))

while this one failed to compile in Clojurescript (just .cljs, no macro 
involved):

  (let [x (cljs.core/Box. 1)] (set! (.val x) 2) (.val x))

Box is already defined as mutable in Clojurescript
https://github.com/clojure/clojurescript/blob/master/src/cljs/cljs/core.cljs#L5891
Why is Clojurescript so aggressive? Or is it a bug?

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