Use substring instead of slicing - double speedup!
Use substring instead of slicing - double speedup!

                      pff
       1,997,810 op/s » tiny (production)
         621,845 op/s » short (production)
       1,386,780 op/s » tiny (5)
         720,355 op/s » short (10)
          77,338 op/s » medium (100)

                      printf
          58,001 op/s » tiny (production)
          22,922 op/s » short (production)
          53,702 op/s » tiny (5)
          30,997 op/s » short (10)
           3,570 op/s » medium (100)

                      printf2
       1,085,254 op/s » tiny (production)
         874,416 op/s » short (production)
         981,879 op/s » tiny (5)
         560,251 op/s » short (10)
          68,190 op/s » medium (100)

floatdrop/pff