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>Ok, I understand now.
>Somehow I thought that the _ identifier was special
>and meant not caring about the value.
>But I realise now that it is just an ordinary variable name.

Yes, it's just a Lua idiom, but "_" is a valid identifier, not special at all.

>Maybe a warning while compiling could be useful.

Emitting warnings is not so simple for embedded languages.
--lhf