Benchmark: timing 1000 iterations of f_alpha, f_cmp, f_owtdi, f_sship, i_alpha, i_cmp, i_owtdi, i_sship...
   f_alpha: 88 secs (86.12 usr  0.04 sys = 86.16 cpu)
     f_cmp: 306 secs (298.55 usr  0.44 sys = 298.99 cpu)
   f_owtdi: 274 secs (266.25 usr  0.40 sys = 266.65 cpu)
   f_sship: 242 secs (238.57 usr  0.20 sys = 238.77 cpu)
   i_alpha: 84 secs (81.57 usr  0.09 sys = 81.66 cpu)
     i_cmp: 301 secs (293.79 usr  0.38 sys = 294.17 cpu)
   i_owtdi: 270 secs (264.43 usr  0.27 sys = 264.70 cpu)
   i_sship: 241 secs (238.31 usr  0.18 sys = 238.49 cpu)
         Rate    f_cmp   i_cmp   f_owtdi i_owtdi f_sship i_sship f_alpha i_alpha
f_cmp     3.34/s      --     -2%    -11%    -11%    -20%    -20%    -71%    -73%
i_cmp     3.40/s      2%      --     -9%    -10%    -19%    -19%    -71%    -72%
f_owtdi   3.75/s     12%     10%      --     -1%    -10%    -11%    -68%    -69%
i_owtdi   3.78/s     13%     11%      1%      --    -10%    -10%    -67%    -69%
f_sship   4.19/s     25%     23%     12%     11%      --     -0%    -64%    -66%
i_sship   4.19/s     25%     23%     12%     11%      0%      --    -64%    -66%
f_alpha  11.61/s    247%    241%    209%    207%    177%    177%      --     -5%
i_alpha  12.25/s    266%    260%    227%    224%    192%    192%      6%      --