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    my $range = 0.1;
    my $i = 0;
...
        print $i."\n";
        $i = $i + $range;
    }

0
0.1
0.2
...
0.8
0.9
1

    my $range = 0.1;
    my $i = 0;
...
        print $i."\n";
        $i = $i + $range;
    }

0
0.1
0.2
...
9.79999999999998
9.89999999999998
9.99999999999998