Rate recursive recursive2 recursive3      eval iterative listutil
recursive     184/s        --        -4%       -24%      -46%      -98%    -100%
recursive2    192/s        5%         --       -20%      -43%      -98%    -100%
recursive3    240/s       31%        25%         --      -29%      -98%    -100%
eval          339/s       84%        76%        41%        --      -97%    -100%
iterative   10240/s     5472%      5225%      4159%     2923%        --     -95%
listutil   205922/s   111960%    106979%     85548%    60701%     1911%       --