Benchmark: timing 500000 iterations of BBFU'S, MINE, Quent's...
    BBFU'S: 20 wallclock secs (19.45 usr +  0.00 sys = 19.45 CPU) @ 25706.94/s (n=500000)
      MINE: 19 wallclock secs (19.87 usr +  0.02 sys = 19.88 CPU) @ 25146.69/s (n=500000)
   Quent's: 25 wallclock secs (24.97 usr +  0.00 sys = 24.97 CPU) @ 20026.70/s (n=500000)
           Rate Quent's    MINE  BBFU'S
Quent's 20027/s      --    -20%    -22%
MINE    25147/s     26%      --     -2%
BBFU'S  25707/s     28%      2%      --