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;

[download]
But its a question of whatever suits.

Software speaks in tongues of man; I debug, therefore I code.

In reply to Re^3: Or, Or, Equals Zero, $x ||= 0 ('') by Erez
in thread Or, Or, Equals Zero, $x ||= 0 by Anonymous Monk

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