Re^3: Or, Or, Equals Zero, $x ||= 0 ('')

[Erez]

If it's on a new code, and no animals are harmed, I don't see a problem with using 5.10 syntax. It's a question of what the people around you like to read. For instance, I'd write it

$x= ''  unless defined $x;

But its a question of whatever suits.