It seems to contradict the documentation found here datatypes 
<https://clojure.org/reference/datatypes#_deftype_and_defrecord>:

> Encapsulation of information is folly. Fields are public, use 
protocols/interfaces to avoid dependencies

It is also not documented in the doc-string, and makes it impossible to 
further extend the type. No more ad-hoc polymorphism basically.

So you can't do this:

(deftype MutableBox [^{:volatile-mutable true} contents])

(defprotocol Container
  (inventory [this]))

(extend-type MutableBox
  Container
  (inventory [this] (.-contents this)))

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