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$x = 1742-1e-12;
$y = 0;
...
  ( $x + $y >= $z ? 'true' : 'false', "\n";
__END__
1742 + 0 >= 1742 is false

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sub round {
  my $number    = shift;
...
  ( $x + $y >= $z ? 'true' : 'false', "\n";
__END__
1742 + 0 >= 1742 is true