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> [...] There are many class libraries available for lua. Just pick one. [...]

Alternatively, embrace the prototype-based programming and just... don't add classes.

In practice though, is prototype-based inheritance useful for anything other than implementing your own class system on top of it?

I hold an opinion that, if you use the prototype-based approach, you should avoid inheritance like the plague ;)

You should avoid it whether prototypes are involved or not.