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> Yes but when these are kicked out of the Lua runtime they won't contain any
> error message at all.  No?

That's because debug.traceback does not do anything useful with
non-string error "messages". As Romulo Bahiense has shown, it is
possible to get around that.

So, to repeat, the Lua core handles non-string error "messages" just fine.
It's just the debug library that is ignoring them. Perhaps debug.traceback
could honor __tostring.