protected static function _strategy($name, $paths = []) {
		if (!$name) {
			$self = get_called_class();
			throw new ConfigException("No strategy set for configuration in class `{$self}`.");
		}
		if (!$class = static::_locate($paths, $name)) {
			$self = get_called_class();
			throw new ConfigException("Could not find strategy `{$name}` in class `{$self}`.");
		}
		return $class;
	}