timethis 10:  0 wallclock secs ( 0.10 usr +  0.01 sys =  0.11 CPU) @ 90.91/s (n=10)
            (warning: too few iterations for a reliable count)
timethis 100:  4 wallclock secs ( 1.05 usr +  0.11 sys =  1.16 CPU) @ 86.21/s (n=100)
timethis 400: 17 wallclock secs ( 4.09 usr +  0.16 sys =  4.25 CPU) @ 94.12/s (n=400)
timethis 1000: 45 wallclock secs (10.64 usr +  0.54 sys = 11.18 CPU) @ 89.45/s (n=1000)