One purpose of defrecord was to be interchangeable with maps, so that you 
can prototype with maps, then switch to defrecord for better performance 
without changing much code.  If you use constructor functions to create 
instances of your records/maps, you hardly have to change anything at all.

Another purpose of defrecord (and deftype) is to support new types that 
implement protocols.

Defrecord adds real type information to maps (accessible through the `type` 
function) but this was already possible with metadata.

-Stuart Sierra
clojure.com

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