Hello，

While working on the Low-level logic flaw in PortSwigger's business logic vulnerabilities, I needed to overflow the product price. To observe this phenomenon, I performed the following calculations:

The maximum integer is 2,147,483,647, and a jacket costs 1337 yuan. The current total amount of goods is already 1337, so an additional 2,147,482,310 is needed, requiring 1,606,194 leather jackets. I can add 99 jackets in one packet, so 16,224 packets are needed. Therefore, I set the repeat packet count to 16,224 with a concurrency of 100. Strangely, during the packet sending process, I refreshed the page and saw negative numbers. Why? It should be approaching the maximum integer.

The calculated number of packets sent is conservatively estimated, and even after sending all, it won't reach the maximum integer. Therefore, during operation, it should remain at a number that hasn't reached the total price. The appearance of a negative number here is something I don't understand.

If you can help me, I'd be grateful