Benchmark: timing 1000 iterations of Schwartzian, Simple...
Schwartzian: 36 wallclock secs (35.58 CPU) @ 28.11/s (n=1000)
    Simple: 149 wallclock secs (149.35 CPU) @  6.70/s (n=1000)
              Rate      Simple Schwartzian
Simple      6.70/s          --        -76%
Schwartzian 28.1/s        320%          --