Found this:

https://groups.google.com/forum/#!searchin/clojure/%22type$20metadata%22%7Csort:date/clojure/LBGsPs2__pQ/oLgx_kgmQxgJ

:tag is applied to source forms to communicate type hints to the 
compiler. :type can be used, by convention, to add 'type names' to 
runtime data structures that support metadata. The type function will 
return the :type metadata if present, else the class, making it a 
handy dispatch function. Neither :tag nor :type are used directly by 
isa? 

Rich



On Wednesday, October 24, 2018 at 12:30:14 AM UTC-7, Didier wrote:
>
> Reviving this thread, as I'd like to kmow if someone can explain the 
> purpose of the type metadata and what is responsible for adding it?

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