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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