protected function compare_terms( $left, $right ) {
		$col = $this->sort_column;
		$left_val = $left->$col;
		$right_val = $right->$col;

		if ( is_int( $left_val ) && is_int( $right_val ) ) {
			return $left_val - $right_val;
		}

		return strcmp( $left_val, $right_val );
	}