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use 5.036;
use strict;  #  not needed but left out of habit
...
    return $i;
}

                Rate a_pairs_alias a_pairs h_by_key h_pairmap h_each h
+_pair_vals h_for_list h_vals a_pair_vals a_pairmap a_for_list
a_pairs_alias 83.5/s            --     -7%     -13%      -33%   -34%  
+      -41%       -53%   -79%        -83%      -84%       -90%
...
a_pair_vals    459/s          504%    397%     330%   257%      254%  
+      193%       155%    41%          --      -13%       -35%
a_pairmap      527/s          594%    470%     394%   311%      306%  
+      236%       192%    62%         15%        --       -25%
a_for_list     705/s          828%    663%     560%   449%      444%  
+      350%       291%   117%         54%       34%         --

perl -v | head -2 | tail -1
This is perl 5, version 36, subversion 0 (v5.36.0) built for x86_64-li
+nux
...
gcc -v 2>&1 | tail -2
Thread model: posix
gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)