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>> Do you really want to write tostring() without arguments? What for?

> It is more as a failsafe for this kind of scenario:
>     table.concat{stuff, tostring(foo()), ... }
> where foo is dynamic and may return nothing.

In this case, if you know you have to protect yourself, use
	table.concat{stuff, tostring((foo())), ... }
Note the extra pair of parentheses around foo().