WP_Widget_Categories::update( array $new_instance, array $old_instance ): array

179	public function update( $new_instance, $old_instance ) {180		$instance                 = $old_instance;181		$instance['title']        = sanitize_text_field( $new_instance['title'] );182		$instance['count']        = ! empty( $new_instance['count'] ) ? 1 : 0;183		$instance['hierarchical'] = ! empty( $new_instance['hierarchical'] ) ? 1 : 0;184		$instance['dropdown']     = ! empty( $new_instance['dropdown'] ) ? 1 : 0;185 186		return $instance;187	}