e.g. this hangs the browser:

(go-loop [ch (to-chan (range))]
(println (<! ch))
(<! (timeout 1000))
(recur ch))

The problem is in
https://github.com/clojure/core.async/blob/53bf7866f195e6ba247ff7122b99784e66e9f1bb/src/main/clojure/cljs/core/async.cljs#L362
where the order of arguments to bounded-count is wrong.