Benchmark: timing 1000 iterations of f_alpha, f_cmp, f_owtdi, f_sship, i_alpha, i_cmp, i_owtdi, i_sship...
   f_alpha: 76 wallclock secs (74.17 usr +  0.10 sys = 74.27 CPU) @ 13.46/s (n=1000)
     f_cmp: 75 wallclock secs (74.12 usr +  0.09 sys = 74.21 CPU) @ 13.48/s (n=1000)
   f_owtdi: 178 wallclock secs (175.29 usr +  0.15 sys = 175.44 CPU) @  5.70/s (n=1000)
   f_sship: 46 wallclock secs (45.62 usr +  0.01 sys = 45.63 CPU) @ 21.92/s (n=1000)
   i_alpha: 67 wallclock secs (66.26 usr +  0.02 sys = 66.28 CPU) @ 15.09/s (n=1000)
     i_cmp: 67 wallclock secs (66.49 usr +  0.08 sys = 66.57 CPU) @ 15.02/s (n=1000)
   i_owtdi: 179 wallclock secs (175.72 usr +  0.17 sys = 175.89 CPU) @  5.69/s (n=1000)
   i_sship: 47 wallclock secs (46.10 usr +  0.02 sys = 46.12 CPU) @ 21.68/s (n=1000)
          Rate i_owtdi f_owtdi f_alpha   f_cmp   i_cmp i_alpha i_sship f_sship
i_owtdi 5.69/s      --      0%    -58%    -58%    -62%    -62%    -74%    -74%
f_owtdi 5.70/s      0%      --    -58%    -58%    -62%    -62%    -74%    -74%
f_alpha 13.5/s    137%    136%      --      0%    -10%    -11%    -38%    -39%
f_cmp   13.5/s    137%    136%      0%      --    -10%    -11%    -38%    -39%
i_cmp   15.0/s    164%    164%     12%     11%      --      0%    -31%    -31%
i_alpha 15.1/s    165%    165%     12%     12%      0%      --    -30%    -31%
i_sship 21.7/s    281%    280%     61%     61%     44%     44%      --     -1%
f_sship 21.9/s    285%    284%     63%     63%     46%     45%      1%      --