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().
whow, I didn't realize that the parentheses can `increase' the
number of values in a explist.
I thought it could only `reduce' it.
shame on me.
I have read the manual, and found the manual said,
>
>In all other
contexts, Lua adjusts the result list to one element, discarding all
values except the first one.
>
I am thinking it might be better saying
"...to one element, either discarding all values except the
first one if the explist is non-empty, or giving a single `nil'
value otherwise."