Benchmark: running a, b for at least 1 CPU seconds...
         a:  1 wallclock secs ( 1.03 usr +  0.01 sys =  1.04 CPU) @ 124.04/s (n=129)
         b:  1 wallclock secs ( 1.08 usr +  0.01 sys =  1.09 CPU) @ 191.74/s (n=209)
   Rate    a    b
a 124/s   -- -35%
b 192/s  55%   --