Looks like it's a bug in PersistentHashMap:
user=> (contains? (hash-map {:a (float 0.5)} 1) {:a (double 0.5)})
false
user=> (contains? (array-map {:a (float 0.5)} 1) {:a (double 0.5)})
true
Immo Heikkinen writes:
> (= (float 0.5) (double 0.5))
> => true
> (= #{(float 0.5)} #{(double 0.5)})
> => true
> (= {:a (float 0.5)} {:a (double 0.5)})
> => true
> (= #{{:a (float 0.5)}} #{{:a (double 0.5)}})
> => false
>
>
> Tested with both 1.6.0 and 1.7.0-alpha5.
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