As niklasjansson points out, this solution breaks Liskov substitution. Squares programmed in such a way are no longer substitutable for rectangles. Breaking Lis

As niklasjansson points out, this solution breaks Liskov substitution. Squares programmed in such a way are no longer substitutable for rectangles. Breaking Liskov substitution is a great way to hide bugs and make your codebase extremely hard to reason about, due to the fact that every subtype can have drastically different behavior than what's defined by the parent type.