Rate rev_chop    regex unpack_C unpack_a    split
rev_chop 10.0/s       --      -1%      -3%     -44%     -50%
regex    10.1/s       1%       --      -2%     -44%     -50%
unpack_C 10.3/s       3%       2%       --     -43%     -49%
unpack_a 18.0/s      80%      77%      74%       --     -11%
split    20.2/s     102%      99%      95%      12%       --