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2014-12-10 16:44 GMT+02:00 Rena <>:

> Interesting. Why is __tostring not a core metamethod? The distinction
> seems arbitrary to me.

A core metamethod is a fallback. It is called when Lua does not
know what to do, as a last resort instead of throwing an error.
__tostring, __pairs etc are called _instead_ of what Lua knows
to do.