Benchmark: timing 500000 iterations of List, Scalar...
    List:  0 wallclock secs ( 0.73 usr +  0.00 sys =  0.73 CPU) @ 683060.11/s (n=500000)
  Scalar:  2 wallclock secs ( 1.38 usr +  0.00 sys =  1.38 CPU) @ 361794.50/s (n=500000)