Hello!
Thank you for your kind words, I'm glad this book can be of any help to anyone, I'm endlessly thankful for your promotion too!
I admit that the Lua version is the newest edition, and definitely the most "rough around the edges" one. It definitely needs a glance-over and it may have mistakes too (I'm handling Lua, Python, JS and C++, plus pseudocode alone).
Lua isn't really an Object-Oriented programming language, but it has huge metaprogramming capabilities which make "class-like things" possible. There are languages like Moonscript which feature classes and compile into Lua, which could be interesting too.
If you end up finding any mistake, or have any kind of suggestion, feel free to hit my up here or on GitHub/GitLab. I'll try to respond as quickly as possible.
Thank you for the good luck, my best wishes to you too!
Penaz.