To be clear: In the example, p1 is not an instance of Person. p1 is just a
map. An actual record has (at least) all of the basis fields.
user> (map->Person {:name "foo"})
#user.Person{:name "foo", :age nil, :company nil}
user> (dissoc *1 :age)
{:name "foo", :company nil} ;; not a record anymore!
user> (assoc *2 :igloo 42)
#user.Person{:name "foo", :age nil, :company nil, :igloo 42}
As a rule of thumb, in Clojure one does not rush to records. If maps are
good enough, one uses maps.
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