protected function getOnlyArrayKeysWhereValueIsNotAnArray($inputArray)
    {
        $keysWithNonArrayValue = [];

        foreach ($inputArray as $key => $value) {
            if (is_array($value)) {
                // configuration for a content object, skipping
                continue;
            }

            $keysWithNonArrayValue[] = $key;
        }

        return $keysWithNonArrayValue;
    }