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use strict;
use warnings;
...
   with    => \&with,
   without => \&without,
});

Benchmark: running with, without, each for at least 10 CPU seconds...
      with: 10 wallclock secs (10.24 usr +  0.00 sys = 10.24 CPU) @ 20
+.40/s (n=209)
...
          Rate    with without
with    20.4/s      --     -0%
without 20.5/s      0%      --