Benchmark: running 1nowant, 2want, 3nowant_list, 4want_list for at least 10 CPU seconds...
   1nowant: 13 wallclock secs (10.67 usr +  0.00 sys = 10.67 CPU) @ 558715.46/s (n=5961494)
     2want: 12 wallclock secs (10.66 usr +  0.00 sys = 10.66 CPU) @ 390887.71/s (n=4166863)
3nowant_list: 11 wallclock secs (10.75 usr +  0.00 sys = 10.75 CPU) @  1.12/s (n=12)
4want_list: 11 wallclock secs (10.72 usr +  0.00 sys = 10.72 CPU) @  1.12/s (n=12)
                 Rate 3nowant_list   4want_list        2want      1nowant
3nowant_list   1.12/s           --          -0%        -100%        -100%
4want_list     1.12/s           0%           --        -100%        -100%
2want        390888/s    35016924%    34919202%           --         -30%
1nowant      558715/s    50051494%    49911815%          43%           --