Rate  recursive recursive2       eval  iterative   listutil
recursive    1244/s         --        -4%       -68%       -97%      -100%
recursive2   1297/s         4%         --       -67%       -97%      -100%
eval         3930/s       216%       203%         --       -91%       -99%
iterative   42708/s      3332%      3192%       987%         --       -85%
listutil   281788/s     22544%     21622%      7071%       560%         --