Tough luck if your filename actually has whitespace on either end of its name

If you have filenames like that, you'll have trouble with more than just Perl. Even whitespace in the middle of filenames has a tendency to break things.

I would personally be more concerned about the backward compatibility. There are a lot of people out there still using 5.003 for one reason or another.

Of course, if you're using newer Perl features anyway, like unicode or threads, then that consideration becomes moot and you may as well use the three-arg form.

$;=sub{$/};@;=map{my($a,$b)=($_,$;);$;=sub{$a.$b->()}}
split//,".rekcah lreP rehtona tsuJ";$\=$ ;->();print$/
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