Benchmark: timing 100000 iterations of SPLIT, UNPACK...
  SPLIT: 25 wallclock secs (23.92 usr +  0.01 sys = 23.93 CPU)
      @ 4178.16/s (n=100000)
  UNPACK: 26 wallclock secs (25.62 usr +  0.01 sys = 25.63 CPU)
      @ 3902.13/s (n=100000)