If $val is undef the loop ends
Yes, right (++), although there are many cases where you know this can't happen. But you are absolutely correct, $val may also be "0" or "", and that is more common. This syntax is broken or at best very dangerous. Which is the reason, BTW, why I would rather use the syntax of first example above, which does not have this problem. I've just corrected my post to strike out this example. Thanks for calling my attention on this.
Comma to the rescue
Yes, thanks, I know you can do that, I was just trying to give an example of a stupid mistake I did 4 or 5 years ago when trying to be too clever.
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