public function set_quantity( $cart_item_key, $quantity = 1, $refresh_totals = true ) {
		if ( 0 === $quantity || $quantity < 0 ) {
			wc_do_deprecated_action( 'woocommerce_before_cart_item_quantity_zero', array( $cart_item_key, $this ), '3.7.0', 'woocommerce_remove_cart_item' );
			// If we're setting qty to 0 we're removing the item from the cart.
			return $this->remove_cart_item( $cart_item_key );
		}

		// Update qty.
		$old_quantity                                      = $this->cart_contents[ $cart_item_key ]['quantity'];
		$this->cart_contents[ $cart_item_key ]['quantity'] = $quantity;

		do_action( 'woocommerce_after_cart_item_quantity_update', $cart_item_key, $quantity, $old_quantity, $this );

		if ( $refresh_totals ) {
			$this->calculate_totals();
		}

		/**
		 * Fired after qty has been changed.
		 *
		 * @since 3.6.0
		 * @param string  $cart_item_key contains the id of the cart item. This may be empty if the cart item does not exist any more.
		 * @param int     $quantity contains the quantity of the item.
		 * @param WC_Cart $this Cart class.
		 */
		do_action( 'woocommerce_cart_item_set_quantity', $cart_item_key, $quantity, $this );

		return true;
	}