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> I am not aware of any difference in behavior. I have never used the
> string.len form, which look to me like an old Lua 5.0 function.
> But I checked in the manual, and was surprised to note that it is not
> marked as deprecated, not even in Lua 5.2.
> To Roberto: is this function still maintained for compatibility, or
> for another reason ?

Mostly for compatibility (and because we did not notice it could
be removed ;)

-- Roberto