public function set($key, $value=null)
    {
        $this->start();
        
        $_SESSION[$key] = $value;
        
        //session_write_close();
        
        $sdata = is_scalar($key) ? [$key => $value] : $key;
        \Wslim\Ioc::logger('session')->debug(sprintf('[%s]set %s:%s', static::getId(), $key, print_r($value, true)));
        
        return $this;
    }