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  1. or download this
    my $x='-3809482.4215422305'+0;
    my $y='-3809482.4215422301'+0;
    
    my $diff = abs( $x - $y );
    print $x,"\n",$y,"\n",$diff,"\n";
    
  2. or download this
    -3809482.42154223
    -3809482.42154223
    4.65661287307739e-10