I'm also wondering if there is any advantage at all to using key/val over 
first/second.  The only downside I can see is that the code won't be clear.

On Wednesday, 4 May 2016 09:52:40 UTC-7, adrian...@mail.yu.edu wrote:
>
> I may be misremembering here, but I think this was briefly implemented for 
> an alpha release of 1.8.0. I think the entire feature in question is being 
> reworked for the future, but I'm uncertain of the details. Perhaps others 
> can chime in with the background motivating those changes and reversions? 
>
> On Wednesday, May 4, 2016 at 12:44:19 PM UTC-4, JvJ wrote:
>>
>>
>> I've noticed that, in Clojure, there is a MapEntry type that supports the 
>> operations "key" and "val", but in Clojurescript, MapEntry is replaced by 
>> simple 2-element vectors.
>>
>> Furthermore, 2-element vectors can be used in almost all other cases 
>> where a MapEntry is expected, and MapEntries support all vector 
>> operations,but "key" and "val" are
>> not supported on these vectors.
>>
>> Is there a particular design reason for this?  It doesn't seem like much 
>> more than an inconvenience
>>
>

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