I may arrive at the party a little late but just to mention I got bitten by
this too (while working on clojure-py, so I actually want to know about the
weird edge cases...)
user=> #{(rand-int 100) (rand-int 100)}
IllegalArgumentException Duplicate key: (rand-int 100)
clojure.lang.PersistentHashSet.createWithCheck (PersistentHashSet.java:68)
Of course you can even replace rand-int by a function which is actually
guaranteed to return different values on consecutive calls, e.g. a closure
over an atom.
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