This is the difference between "simple" and "easy", as Rich Hickey so eloquently put it. C--this part of it, at least--is easy. You can write code without havin

This is the difference between "simple" and "easy", as Rich Hickey so eloquently put it. C--this part of it, at least--is easy. You can write code without having to think about the different integer types, thanks to the complex integer promotion rules. Rust and Go are simple: the semantics are clear and understandable, at the cost of requiring the programmer to think about this aspect of numeric types. As programmers, we often mistakenly think that simple decisions automatically lead to an easy interface for the user; sometimes they do, but not always. (On balance, I personally think that not having the implicit conversions, as Rust and Go do, is generally the better decision, but I certainly acknowledge that C is easier in this regard.)