protected function _inherit() {

		$inherited = array_fill_keys($this->_inherited(), []);

		foreach (static::_parents() as $parent) {
			$parentConfig = get_class_vars($parent);

			foreach ($inherited as $key => $value) {
				if (isset($parentConfig["{$key}"])) {
					$val = $parentConfig["{$key}"];
					if (is_array($val)) {
						$inherited[$key] += $val;
					}
				}
			}

			if ($parent === __CLASS__) {
				break;
			}
		}

		foreach ($inherited as $key => $value) {
			if (is_array($this->{$key})) {
				$this->{$key} += $value;
			}
		}
	}