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  1. or download this
    sub equalOrBothNull
{
...
   ((defined($a) && defined($b) && $a==$b) ||
    (!defined($a) && !defined($b));
}
  2. or download this
    not defined($a) && not defined($b)
  3. or download this
    $ perl -MO=Deparse -e'not defined($a) && not defined($b)'
not defined $a && !defined($b);
-e syntax OK