As background re the collection 
model: http://insideclojure.org/2016/03/16/collections/

Keys and vals are both defined as functions that take a seqable of map 
entries. Given that definition, it is not easily possible to widen it to 
also take a collection with the associative trait, because a collection 
like vector will not produce a seq of entries, but rather a seq of vector 
values. The ability to seq to map entries is something only provided by 
maps. 

Yes, it would be possible to make a function that worked on either, but I 
think doing so would break the existing contract of these functions, not 
extend it.

To the design question of whether it should have been done this way or not 
in the first place, that's harder for me to say. 


On Friday, July 8, 2016 at 11:50:22 PM UTC-5, Michael Gardner wrote:
>
> I've looked around, but couldn't find any discussion on the topic. Is it 
> purely an implementation thing, or a design choice? 
>
> (Yes, I realize you can just do (range (count v)).)

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