timethis 10:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)
timethis 100:  0 wallclock secs ( 0.06 usr +  0.00 sys =  0.06 CPU) @ 1666.67/s (n=100)
            (warning: too few iterations for a reliable count)
timethis 400:  1 wallclock secs ( 0.26 usr +  0.01 sys =  0.27 CPU) @ 1481.48/s (n=400)
            (warning: too few iterations for a reliable count)
timethis 1000:  2 wallclock secs ( 0.77 usr +  0.03 sys =  0.80 CPU) @ 1250.00/s (n=1000)
timethis 10000: 19 wallclock secs ( 6.81 usr +  0.41 sys =  7.22 CPU) @ 1385.04/s (n=10000)