The computer cannot accurately store 1/10 since it's a periodic number in binary (just like 1/3 is periodic in decimal).

>perl -e"printf '%.16e', 0.1"
1.0000000000000001e-001
                 ^
                 |
                 |
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Avoid the accumulation of error:

for (0..89) {
   my $i = $_ / 10;
   print "$i\n";
}
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Update: and/or round your results.