> But you probably will have to differentiate at some point between what you're inserting. Why not just do that, instead of artificially combine it into one function?
Why prematurely optimize for differences that may not (and in practice aren't really likely to) happen?
Keep in mind that the tradeoff with generics is usually not 3 lines of clear or 1 line of hard to read, it's one line of clear code (T -> T), one line of unclear code (Interface{} -> Interface{} + casts), or n lines of complex code (concretely reimplementing the function for your particular case).
