Benchmark: timing 5 iterations of jc, mk, ys...
        jc: 19 wallclock secs (16.75 usr +  0.35 sys = 17.10 CPU) @  0.29/s (n=5)
        mk:  6 wallclock secs ( 6.00 usr +  0.01 sys =  6.01 CPU) @  0.83/s (n=5)
        ys:  7 wallclock secs ( 6.00 usr +  0.00 sys =  6.00 CPU) @  0.83/s (n=5)
   s/iter   jc   mk   ys
jc   3.42   -- -65% -65%
mk   1.20 185%   --  -0%
ys   1.20 185%   0%   --