Well not quite: 

> (contains? (transient #{1 2 3}) 1)
false
> *clojure-version*
{:major 1, :minor 4, :incremental 0, :qualifier nil}
>  

So it used not to throw but return a wrong value instead, which was worse. 

On Wednesday, December 4, 2013 2:50:19 PM UTC+1, Max Penet wrote:
>
> Also it seems it used to work on clojure 1.4
>
> On Wednesday, December 4, 2013 2:29:35 PM UTC+1, Stefan Kamphausen wrote:
>>
>> It looks like you're onto something here
>>
>> get works with transient maps:
>>
>> (get (transient {:a 1 :b 2}) :a)
>> ;=> 1
>>
>> and with transient vectors, too:
>>
>> (get (transient [1 2 3]) 0)
>> ;=> 1
>>
>> but not with transient sets:
>>
>> (get (transient #{1 2 3}) 2)
>> ;=> nil
>>
>> And using contains? in a reduce with a transient accumulator does not 
>> seem too far fetched to me.
>>
>> According to clojure.org/transients: "Transients support the read-only 
>> interface of the source, i.e. you can call *nth*, *get*, *count* and 
>> fn-call a transient vector, just like a persistent vector."
>>
>> Did you search in Jira whether this is a known issue?
>>
>>
>> Regards,
>> Stefan
>>
>

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