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use strict;
use warnings;
...
sub test_mapf {
    return map { sqrt $_ } @source;
}

       Rate  map  for mapf forv mapv
map  2.24/s   --  -3% -31% -49% -78%
...
mapf 3.27/s  46%  41%   -- -26% -68%
forv 4.43/s  98%  92%  36%   -- -56%
mapv 10.1/s 353% 339% 210% 129%   --

         Rate  for  map mapf forv mapv
for   23849/s   --  -3% -29% -46% -76%
...
mapf  33666/s  41%  37%   -- -24% -66%
forv  44571/s  87%  82%  32%   -- -56%
mapv 100159/s 320% 309% 198% 125%   --