private function doSetCfg($cfg)
    {
        $return = array();
        foreach ($cfg as $k => $v) {
            if ($k == 'debug') {
                $return[$k] = \array_intersect_key($this->cfg, $v);
                $this->setDebugCfg($v);
            } elseif (isset($this->debug->{$k}) && \is_object($this->debug->{$k})) {
                $return[$k] = \array_intersect_key($this->getCfg($k.'/*'), $v);
                $this->debug->{$k}->setCfg($v);
            } elseif (isset($this->cfgLazy[$k])) {
                $return[$k] = \array_intersect_key($this->cfgLazy[$k], $v);
                $this->cfgLazy[$k] = \array_merge($this->cfgLazy[$k], $v);
            } else {
                $return[$k] = array();
                $this->cfgLazy[$k] = $v;
            }
        }
        return $return;
    }