Since that time HAMT was invented and successfully used in Scala and Clojure, so this talk didn't age well.

	▲	zelphirkalt 2 days ago \| parent \| next [-]
		Do you know of any implementation, that is well annotated/commented, so that it is easy to understand?
	▲	ndr 2 days ago \| parent \| prev [-]
		HAMT weren't immutable/persistent until Clojure though: https://en.wikipedia.org/wiki/Persistent_data_structure#Pers... Still well before the talk.