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package Foo;

...
    k4 => sub { do_something       },      
    k5 => sub { &do_something      },      
});

       Rate  k2  k1  k4  k3  k5
k2 359975/s  -- -3% -6% -7% -8%
...
k4 382293/s  6%  3%  -- -2% -3%
k3 388120/s  8%  5%  2%  -- -1%
k5 392991/s  9%  6%  3%  1%  --