I support this change. Not only is it closer to the GIGO philosophy, but 
"let x in S" is actually a very reasonable use-case. Sometimes I just want 
an element from a set and I don't care about which particular one.

Your code may break if you're using try/catch to handle sets in a special 
way, but I can't imagine a situation where using clojure.core/set? wouldn't 
be simpler and more appropriate.

Le samedi 4 juin 2016 09:32:09 UTC-7, Atamert Ölçgen a écrit :
>
> Hi Alex,
>
> On Sat, Jun 4, 2016 at 3:22 PM, Alex Miller <al...@puredanger.com 
> <javascript:>> wrote:
>
>> Why?
>>
>
> Because unordered collections shouldn't have heads defined.
>
> Is (first #{3 1 2}) => 3? or 2? or 1?
>
> (I just tried it in a REPL and it is apparently 1.)
>
>  
>
>>
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>
>
> -- 
> Kind Regards,
> Atamert Ölçgen
>
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