I just happened to come across this when I'm working on a game that uses a lot of data structures. This is honestly just what I needed!
Viewing post in GM Arrays (Deprecated) comments
I know is 2 years late, but this library is now part of GML-Extended, a library with a lot more snippets and functions to work on and that has support from GameMaker v2.3.7 up to v2024.4. :D