alt Hacker News> why would you ever design a program where a change in one place affects the other
If that would be possible, there would be no function signatures.
> why would you ever design a program where a change in one place affects the other
If that would be possible, there would be no function signatures.
Exactly. It's painfully easy to break duck typed functional code in confusing ways by subtly changing the semantics of a higher order library function that's used all over the codebase. I love lisps but IMO in general not having static types is on par with not having a debugger. It's probably my only real complaint about standard scheme.