Is it safe to alter an atom while iterating that atom's value? It seems
to work as I would expect, but am I just getting lucky (and are there
concurrency issues)?
user=> (let [a (atom #{1 2 3 4 5})]
(doseq [x @a] (prn @a) (swap! a disj x)))
#{1 2 3 4 5}
#{2 3 4 5}
#{3 4 5}
#{4 5}
#{5}
nil
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