The usefulness of the Default class came from its ability to generically derive Default instances. I would argue that adding a GDefault instance for sum types (which selects the first constructor) would further boost its usefulness. Plus we lose nothing from adding this since right now we need to manually write Default instances for sum types anyways.
The usefulness of the Default class came from its ability to generically derive
Defaultinstances. I would argue that adding aGDefaultinstance for sum types (which selects the first constructor) would further boost its usefulness. Plus we lose nothing from adding this since right now we need to manually write Default instances for sum types anyways.