File Upload Validation Broke

I confirm uploading with AJAX using CI's getFile() does not work. Either it is bugged or it's not meant to be used with AJAX (or I have an error in my code) - and we should use something else. Here is a quick test.
Simple tests:

PHP Code:

public function upload_with_ajax_not_working()
{
    if ($this->request->isAJAX()) {

        $test = $this->request->getFile('file');
        $response['status'] = json_encode($test);

        return $this->response->setJSON($response);
    }
    return '{"error":"Invalid Request"}';
}

public function upload_with_ajax_working()
{
    if ($this->request->isAJAX()) {

        $test = $_FILES['file'];
        $response['status'] = json_encode($test);

        return $this->response->setJSON($response);
    }
    return '{"error":"Invalid Request"}';
} 


You can see things I made with codeigniter here: itart.pro its not overly impressive as I have very little time to learn.