I'm looking to use this for LuaJIT, but it would require to adjust the libraries for some basic functions (such as unpack, setfenv, loadstring, etc.), as well as the parser to support things like 0ULL. Is there support planned for this, or is this entirely out of scope?

I managed to adjust it locally to add some functions to it, but I would love it if you could change the language version dynamically, like with the vscode-lua extension: