How is the support for modifications in the game when using LuaJIT?

Question

Game development

The code of the game is partially closed in the form of machine code, and partially documented for the players.
Will it be possible for players to make modifications that perform a full-fledged injection (replacement of Lua functions, tables, meta tables) in the compiled game code? Are there any limitations compared to using the classic Lua library?
Access to the entire source code and the ability to completely recompile the player is not provided.