public function add($test = null, array $options = []) {
		$resolve = function($test) {
			switch (true) {
				case !$test:
					return [];
				case is_object($test) && $test instanceof Unit:
					return [get_class($test)];
				case is_string($test) && !file_exists(Libraries::path($test)):
					return $this->_resolve($test);
				default:
					return (array) $test;
			}
		};
		if (is_array($test)) {
			foreach ($test as $t) {
				$this->_data = array_filter(array_merge($this->_data, $resolve($t)));
			}
			return $this->_data;
		}
		return $this->_data = array_merge($this->_data, $resolve($test));
	}