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%a = 1..2e6; %b = 1..2e6;
cmpthese -1, { 
...
C 290/s   4%   -- -28% -28%
A 404/s  44%  39%   --  -1%
B 406/s  45%  40%   1%   --

%a = 1..2e6; %b = ();
cmpthese -1, {
...
D 293/s   2%   -- -28% -29%
A 410/s  43%  40%   --  -1%
B 415/s  44%  41%   1%   --

use strict;
use warnings;
...
       Rate empty  full
empty 407/s    --   -4%
full  426/s    5%    --

...
    cmpthese -1, {
...
fake  400/s    --   -3%   -3%
full  411/s    3%    --   -0%
empty 411/s    3%    0%    --

...
    cmpthese -1, {
...
fake  4689731/s    --   -4%  -16%
full  4906438/s    5%    --  -12%
empty 5604762/s   20%   14%    --

for my $len (2..6) {
    our ($full, $empty);
...
full  31036076/s    6%    --  -31%
fake  44964665/s   53%   45%    --
...