I'm having trouble isolating a small test case. I call the following code
in an update tick:
(let [prev' @prev
state' @state]
(let [rems (clojure.set/difference prev' state')
adds (clojure.set/difference state' prev')]
(reset! prev state')
(assert (= (count rems) (count (set rems))))))
(prev and state hold sets of maps.)
After running for a few minutes, the assert will fail. The 'rems' and
'adds' will report that their count is > 1, but when I try to access the
elements there are either none or only one.
What would cause a set to return an incorrect value for count?
FWIW, the elements of the sets are maps, and one of the fields holds a
mutable javascript array. That was my first suspicion, but the array isn't
mutated in my code, and I use a memoized function to generate it (to
preserve identity).
I'm using [org.clojure/clojurescript "0.0-2202"].
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