Your solution is definitely buggy.
Let's say %$ref_cookie contains
-foo => 'food',
-bar => 'bard'
The solution you propose would push
'foo', undef, 'bar', undef
-or-
'bar', undef, 'foo', undef
(depending on the order the keys are returned)
That's obviously not what he wants. He would just use undef if so.
Fine, you'll say %$ref_cookie should contain
-foo => 'food',
foo => 'fool',
-bar => 'bard',
bar => 'barl'
The solution you propose would push
'foo', 'fool', 'fool', 'bar', 'barl', 'barl'
-or-
'foo', 'fool', 'fool', 'fool', 'bar', 'barl'
-or-
undef, undef, 'bar', 'barl', 'foo', 'fool'
-or-
...
(depending on the order the keys are returned)
It makes no sense. I suspect the OP wants
'foo', 'food', 'bar', 'bard'
-or-
'bar', 'bard', 'foo', 'food'
(depending on the order the keys are returned)
That is achieved using the solution I proposed.
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