Copy and clone have specific meanings and must resolve to the type of the class itself - basically copy or cloning a class of type A gets you another class of t

Copy and clone have specific meanings and must resolve to the type of the class itself - basically copy or cloning a class of type A gets you another class of type A always. It's possible, from a language sense, to have an implementation of box that could directly clone the trait, but I don't believe it would have a reasonable api.