Related to Lua - I've been maintaining this project that has Lua 5.1-5.5 in one Rust project [1]. The main reason to use it over mlua or the normal C Lua is for something that plays nicely with WASM/ general cross compilation or wants to support several different versions of Lua.

Seems like hyprland is on C++ so maybe not a direct use case but thought Lua people in general might be interested.

[1] https://github.com/ianm199/omnilua