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ackermann(0..3, 4)

...
              Rate swampyankee     ikegami
swampyankee 26.8/s          --        -88%
ikegami      220/s        724%          --

use strict;
use warnings;
...
      ikegami     => $pragma . 'undef %ikegami::cache; for (0..$i) { m
+y $rv =     ikegami::ackermann($_, $j); }',
   });
}