Why do edge cases still exist?

Edge cases still exist because not everything fits perfectly, just like how not every toy fits into a single box.

Imagine you have a big bin full of different toys, cars, blocks, balls, and puzzles. Now imagine you try to fit all of them into one kind of box: a long, narrow shoebox. Some toys will fit nicely inside, maybe the small blocks or the tiny cars, but others won’t. The big ball might roll out, and the puzzle pieces could get bent.

That’s like how edge cases work in real life, they’re the things that don't quite match up with what we expected or designed for. Just like some toys need a bigger box or a different kind of container, some situations need special attention too.

When we make rules or build systems, we often think about the most common things, like the small blocks and cars. But there are always some unusual things that come up. Those unusual things are the edge cases.

Even if we try to plan for everything, some surprises still pop up, just like a big ball rolling out of your shoebox!