[majewsky]

> It’s littered all over the go code I’ve seen, including the standard library.

From my experience, interface{} is incredibly uncommon in application code. In most instances where the standard library uses it, it's usually justified because the function in question really accepts literally any type of argument, e.g. json.Marshal() or reflect.TypeOf(). The only counterexample I can think of are sort.Sort() and sort.Slice().

Given all the implications of adding generics to the language, I think Go would be better off just adding the common higher-order list/map manipulation functions to the builtins, i.e. the likes of map(), filter(), maybe reduce().