Well, I think there is some impedance mismatch here. He kind-of suggested resetting the stack "to remove left-over items". He also mentioned something about forgetting to pop an item. These kinds of comments are really... weird. I mean, what is Lua supposed to do if you forget to pop something?

This is an example where a valid personal opinion ("I don't like stack-based apis") crosses the line into something else ("Lua is defective").