> ./each-vs-key-values.pl 
BEGIN, hash: short
Benchmark: running each, keys_values for at least 5 CPU seconds...
      each:  6 wallclock secs ( 5.26 usr +  0.01 sys =  5.27 CPU) @ 44213.85/s (n=233007)
keys_values:  6 wallclock secs ( 5.63 usr +  0.01 sys =  5.64 CPU) @ 107908.33/s (n=608603)

                Rate        each keys_values
each         44214/s          --        -59%
keys_values 107908/s        144%          --
END, hash: short

BEGIN, hash: long
Benchmark: running each, keys_values for at least 5 CPU seconds...
      each:  7 wallclock secs ( 5.83 usr +  0.00 sys =  5.83 CPU) @ 166.38/s (n=970)
keys_values:  6 wallclock secs ( 5.30 usr +  0.00 sys =  5.30 CPU) @ 695.09/s (n=3684)

             Rate        each keys_values
each        166/s          --        -76%
keys_values 695/s        318%          --
END, hash: long

BEGIN, hash: alphabet
Benchmark: running each, keys_values for at least 5 CPU seconds...
      each:  5 wallclock secs ( 5.24 usr +  0.01 sys =  5.25 CPU) @ 3626.29/s (n=19038)
keys_values:  5 wallclock secs ( 5.20 usr +  0.00 sys =  5.20 CPU) @ 13917.12/s (n=72369)

               Rate        each keys_values
each         3626/s          --        -74%
keys_values 13917/s        284%          --
END, hash: alphabet