Benchmark: timing 25 iterations of Double, Single...
    Double:  3 wallclock secs ( 3.13 usr +  0.14 sys =  3.27 CPU) @  7.65/s (n=25)
    Single:  3 wallclock secs ( 3.18 usr +  0.06 sys =  3.24 CPU) @  7.72/s (n=25)
         Rate Double Single
Double 7.65/s     --    -1%
Single 7.72/s     1%     --