> If you know that code will be extended to accept additional fields Well, you rarely know, more often "guess". There's an important distinction between publi

> If you know that code will be extended to accept additional fields Well, you rarely know, more often "guess". There's an important distinction between public and private interfaces. With public interfaces, I contend that it does make sense to think about future use cases and put in some flexibility even at the cost of a small overhead.