This is only the case* when there is actually something to be gained by specializing the implementation of a data type or function for a given type. In my expe

This is only the case* when there is actually something to be gained by specializing the implementation of a data type or function for a given type. In my experience that isn't particularly common. * Excluding Go's implementation of generics, which are frequently less performant than even vtable dispatch, let alone manually copied implementations.