Like CLJS-2113, but for aget:
Also note that Clojure acts as if rounding indices down to the nearest integer while ClojureScript does not:
yields 1 in Clojure and nil in ClojureScript.
(Presumably, similar results hold for aset.)
The fact that Clojure's aget happens to work on non-integer indices may not be intentional. An int cast may be present only to ease interop with the default use of long integral values in Clojure, and while this cast causes the observed behavior (rounding down of passed double s), this may not reflect the intended API.
Here is a commit that speaks to "hints": https://github.com/clojure/clojure/commit/742619e583400400e69cd46ab9e9536c10afb738