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my $a = 3.0;
my $b = '3.0';
...
my $numberCompareResult = $a == $b?'true':'false';
print ("\$stringCompareResult: $stringCompareResult\n");
print ("\$numberCompareResult: $numberCompareResult\n");

$stringCompareResult: false<br>
$numberCompareResult: true<br>

sub is_numeric {
  ($_[0] & ~ $_[0]) eq "0";
}