And what if you have a file named, "old.old"?

On older Perl's, what if your directory exceeds the limit of the shell?

And before using glob freely, I like worrying about what happens if someone use a space in a path. I see no reason to open myself up to that.

As you can tell, I like to be the kind of person who anticipates potential problems and heads them off at the pass. So even though it isn't so short, I tend to use an explicit opendir/readdir/grep solution rather than globbing. YMMV.