Skip-template and categories in Runway

Hi,

With Perch 2.7.7, I could get the labels of categories by doing so:

$results = perch_content_custom('Episodes', array(
       'skip-template' => true,
       'filter' => 'slug',
       'match' => 'eq',
       'value' => perch_get('s'),
       'count' => 1
));

print_r($results[0]['themes'])

This no longer works after upgrading to Runway. Instead of returning an array with the labels of categories, I'm getting what seems to be id's.

$results = perch_collection('Episodes', array(
       'skip-template' => true,
       'filter' => 'slug',
       'match' => 'eq',
       'value' => perch_get('s'),
       'count' => 1
));

print_r($results[0]['themes'])

Array
(
    [0] => Array
        (          
            [themes] => Array
                (
                    [0] => 31
                    [1] => 34
                )
        )

)

Am I missing something?

Cheers,