_defaultConfigClass example

    public function __set($name, $value)
    {
        if ($this->_allowModifications) {
            if (\is_array($value)) {
                $value = new $this->_defaultConfigClass($value, true);
            }
            if ($name === null) {
                $this->_data[] = $value;
                $this->_count = \count($this->_data);
            } else {
                $this->_dirtyFields[] = $name;
                parent::__set($name, $value);
            }
        } else {
            throw new Enlight_Config_Exception('Enlight_Config is read only');
        }
    }