问无法在Restler 3 rc5中导出csv格式的响应

EN

public function downloadCSV()
{
$array = array(
    "foo", "bar"
);

return $array;
}

 $r->setSupportedFormats('CsvFormat', 'JsonFormat'); 

public function encode($data, $humanReadable = false)
{
    $char = Object::$separatorChar;
    Object::$separatorChar = false;
    $data = Object::toArray($data);
    Object::$separatorChar = $char;
    if (is_array($data) && array_values($data) == $data) {
        //if indexed array
        $lines = array();
        $row = array_shift($data);
        if (array_values($row) != $row) {
            $lines[] = static::putRow(array_keys($row));
        }
        $lines[] = static::putRow(array_values($row));
        foreach ($data as $row) {
            $lines[] = static::putRow(array_values($row));
        }
        return implode(PHP_EOL, $lines) . PHP_EOL;
    }
    throw new RestException(
        500,
        'Unsupported data for ' . strtoupper(static::EXTENSION) . ' format'
    );
}

$array = array( "foo", "bar" );