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  1. or download this
                  s/iter    With undef Without undef
With undef      22.5            --           -9%
Without undef   20.6           10%            --
  2. or download this
                  s/iter    With undef Without undef
With undef      22.5            --           -8%
Without undef   20.7            9%            --
  3. or download this
    use strict;
use warnings;
...
    'Without undef' => \&without_undef,
    'With undef' => \&with_undef,
});