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           Rate    regex unpack_C unpack_a    split
regex    9.95/s       --      -2%     -46%     -50%
unpack_C 10.1/s       2%       --     -45%     -49%
unpack_a 18.3/s      84%      80%       --      -9%
split    20.0/s     101%      97%       9%       --

use strict;
use warnings;
...

local our $buf = "abcdef\x00ghik" x 10_000;
cmpthese(-2, \%tests);