Well, the default case (leave them out, make do for the time being) allows the option of adding generics later on (in a hypothetical Go 2.0 or later). Using a

Well, the default case (leave them out, make do for the time being) allows the option of adding generics later on (in a hypothetical Go 2.0 or later). Using a half-baked model and implementation now boxes the language in later on.