Not the parent but there are several high quality native (meaning no CGO) Lua implementations for Go and it's a great choice if you want an embedded scripting language:

https://github.com/yuin/gopher-lua

https://github.com/Shopify/go-lua

Unless you specifically need a JVM either of these will be a much more practical and mature choice for embedded scripting.

Alternatively if you prefer JS then Otto is a good choice: https://github.com/robertkrimen/otto

Advantages, Lua is old and simple so implementing it was a breeze. Disadvantage, I kept running into scenarios where oop made more sense and extending an interface. I could have done that through convention, but it’s not for me. I need to “enforce” the interface more than just a try catch. That led me to Python. Which also worked and suited that need for interface contracts but it introduced new problems. How can I enforce memory guards and sandboxing and execute parallel Python contexts? I ran into road blocks and gave Otto a try as it’s written in go, I would have more luck making the necessary changes if I needed a feature.