It must be [CHAMP](https://blog.acolyer.org/2015/11/27/hamt/#:~:text=CHAMP%20stands%20for%20Compressed%20Hash,by%20Scala%20and%20Clojure%20programmers https://b

It must be [CHAMP](https://blog.acolyer.org/2015/11/27/hamt/#:~:text=CHAMP%20stands%20for%20Compressed%20Hash,by%20Scala%20and%20Clojure%20programmers https://blog.acolyer.org/2015/11/27/hamt/#:~:text=CHAMP%20st....). Acronym for Compressed Hash-Array Mapped Prefix-tree. It is a current state of the art persistent hashtable. I'm surprised that no one mentioned this before, because it is super useful!