ajax call, "with" for data serialization - how to handle array

I've an ajax link like this:

echo $ajax->link('remove', array(
'controller' => 'posts',
'action' => 'remove',
$id
),
array(
'update' => 'ajaxContent',
'with' => '{
username: "'.$user.'",
page: "'.$page.'",
sort: [\'ab\', \'cd\'],
direction: [12, 23]
}'
)
);

In controller I debug $this->params['form'] and response is:
Array
(
[username] => admin
[page] => 1
[sort] => cd
[direction] => 23
)

As you can see, sort and direction just store last item of serialized
element (cd and 23), how can I code the with parameter to render an
array of all sort and direction elements???

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