Benchmark: timing 100 iterations of granfather, usual...
granfather:  3 wallclock secs ( 3.58 usr +  0.00 sys =  3.58 CPU) @ 27.95/s (n=1
00)
     usual:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)