Numeric types are weird in Java and .net. I'm more familiar with C#, but in C# adding two int's result an int, but adding two short's also result in an int. So

Numeric types are weird in Java and .net. I'm more familiar with C#, but in C# adding two int's result an int, but adding two short's also result in an int. So addition is not polymorphic the way you would expect it to be. C# has a large number of numeric types, but below the hood it only supports arithmetic operations on three of them. The problem is not with the implementation of generics per se, the problems is numeric types in those languages is a really leaky abstraction.