Why would it? When you change the name of nth argument from foo to bar, compile will fail and then you just need to do a global rename. Is there any scenario where this would not be feasible?
The caller can't do a global rename if they don't own the source of the function -- because it's in a library. Which is what parent meant by "reverse dependency": the library's interface is constrained by the fact that it has users.
Surely if the library interface changes the users can change their own code? That's why we have versioning of libraries - so that users of the library can take intelligently new versions into use, and especially so they are aware if (and when) the interface changes.
