Benchmark: running hashslice, hashslice_pre, original, original_pre for at least 5 CPU seconds...
 hashslice:  5 wallclock secs ( 5.29 usr +  0.00 sys =  5.29 CPU) @ 97.35/s (n=515)
hashslice_pre:  5 wallclock secs ( 5.30 usr +  0.01 sys =  5.31 CPU) @ 1757.63/s (n=9333)
  original:  5 wallclock secs ( 5.30 usr +  0.00 sys =  5.30 CPU) @ 91.51/s (n=485)
original_pre:  5 wallclock secs ( 5.33 usr +  0.00 sys =  5.33 CPU) @ 817.07/s (n=4355)