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$ perl -e' printf "%.20f\n", 1.6;'
1.60000000000000008882

$ perl -e'
   for ($i=1.1;$i<=1.6;$i+=.1) { printf "%.20f\n", $i; }
...
1.50000000000000044409

1.60000000000000053291

$ perl -le'for my $i (1..6) { print 1+$i/10 }'
1.1
...
1.4
1.5
1.6