I've forgot the most interesting part :)
user> (= s1 s2)
true
user> (= (seq s1) (seq s2))
false
JW
On Sat, Feb 8, 2014 at 11:32 PM, Jozef Wagner <jozef.wag...@gmail.com>wrote:
> Yes. Behold a Murmur3 hash collision:
>
> user> (def n1 -2023261231)
> #'user/n1
> user> (def n2 9223372036854771971)
> #'user/n2
> user> (== (hash n1) (hash n2))
> true
> user> (def s1 (conj #{} n1 n2))
> #'user/s1
> user> (def s2 (conj #{} n2 n1))
> #'user/s2
> user> (= s1 s2)
>
> But practically, I cannot think of any scenario where you will need a
> guarantee that two unordered non identical but value equivalent collections
> need to produce same ordered seq.
>
> JW
>
>
> On Sat, Feb 8, 2014 at 10:14 PM, Andy C <andy.coolw...@gmail.com> wrote:
>
>> On Sat, Feb 8, 2014 at 1:46 PM, Jozef Wagner <jozef.wag...@gmail.com>wrote:
>>
>>> Two collections equivalent by their values may easily have a different
>>> order of their items.
>>>
>>
>>
>> It all boils down this:
>> is it possible to have two clojure.lang.PersistentHashSet with
>> identical values (in mathematical sense) but producing different seqs?
>>
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>
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