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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