general computer architecture like the max size of an integer. High level languages usually abstract this away. How a whole number is represented at the hardware level.
Genuine question - when would you need to know the int size? When do you think knowing how negative numbers are represented in binary would help a web developer? Seriously curious. Edit: sure it's good to know, but that's another question.
I'm sorry, but do you just disregard overflow in your applications?
Just because software is on the web, doesn't mean it doesn't have to care about logic errors