Uninitialized variables are zero. Composite literals may omit fields, and they'll be zero. Map accesses for nonexistent keys return zero values. Channel receives from closed channels return zero values. make returns zero-valued slices. Comma-ok style type assertions return zero values. Slices are fat pointers where the zero value avoids an allocation for data.
Now you're creating a flavor of types that cannot be used in many places. Or worse, a flavor of types that when added to a struct breaks existing uses. That'd be a major change.
