Benchmark: running hashslice, hashslice_pre, original, original_pre for at least 5 CPU seconds...
 hashslice:  5 wallclock secs ( 5.04 usr +  0.04 sys =  5.08 CPU) @  7.28/s (n=37)
hashslice_pre:  5 wallclock secs ( 5.27 usr +  0.01 sys =  5.28 CPU) @ 93.56/s (n=494)
  original:  5 wallclock secs ( 5.08 usr +  0.01 sys =  5.09 CPU) @  6.68/s (n=34)
original_pre:  6 wallclock secs ( 5.37 usr +  0.00 sys =  5.37 CPU) @ 46.93/s (n=252)