More on this behavior http://dev.clojure.org/jira/browse/CLJ-1036
On Thu, Jan 22, 2015 at 2:00 PM, Nicola Mometto <brobro...@gmail.com> wrote:
>
> Looking at the PHM impl, this looks like it's caused by (float 0.5) and
> (double 0.5) hashing differently.
>
> user=> (= (float 0.5) (double 0.5))
> true
> user=> (map hash [(float 0.5) (double 0.5)])
> (1056964608 1071644672)
>
> Nicola Mometto writes:
>
> > 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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