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  $x=15;
  $x.=4;
  $x+=2; # ==> 156

$temp1=eval { 0+$value1 };
$temp1=$value1 if $@; Perl says it is not a number
...
# By virtue of eval, we can now use string equality
# even if the values were numbers before.
if ($temp1 eq $temp2) { ... }