On Wednesday, February 21, 2018 at 7:34:00 PM UTC-6, Didier wrote:
>
> I would actually love it if Spec was extended to have the concept of types.
>

Map specs are about attribute aggregation, not about types.

https://clojure.org/about/spec#_map_specs_should_be_of_keysets_only
 

> Something where every spec could be tied to a Type, and types could be 
> constructed to have Hierarchies.
>

You can effectively do this already. When you have s/keys maps which are 
sets of attributes, you can simply combine sets (base and extensions) using 
s/merge. Or when needing more polymorphism, s/multi-spec.

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