The concern around C-style nullable pointers is that you can't opt out of nullability; everything you point to may or may not dereference. As opposed to other d

The concern around C-style nullable pointers is that you can't opt out of nullability; everything you point to may or may not dereference. As opposed to other designs (e.g. "optional" types leveraging generics) that are opt-in, and thus let you choose which references are always valid and which ones are not.