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use strict;
use warnings;
...
    }
  }
}

Benchmark: running no_integer_module  , with_integer_module for at lea
+st 20 CPU seconds...

...
                    s/iter no_integer_module   with_integer_module
no_integer_module     1.09                  --                -33%
with_integer_module  0.732                 48%                  --