person.clj

(defbox Account
  ;; the second item in the
  ;; list is a type or protocol
  ;; to restrict the value to
  (:name       LWWRegister :required true)
  (:address    LWWRegister :required true)
  ;; specify a default value for this field,
  ;; in this case, the result of calling the
  ;; function `lww-set`
  (:followers  ObservedRemoveSet :default (lww-set)))

(def person (Account.))

(-> person
  ;; add :bar to the followers list
  (update-in [:followers] conj :bar)
  ;; set the name
  (assoc-in  [:name]      "Reid")
  ;; set the address
  (assoc-in  [:address]   "27 Lexington Ave"))