This is one of the obvious consequences of not having a national identity number assigned to everyone at birth, which exist in most developed countries, except for anglosphere, for some reason.
I mean in theory, it doesn't have to be a serial number, and I think that's better. Something about it suggests being enlisted in a national army. It says the state assigns "A body" a number. -vs- The state is made up of us as individuals. So while the serial keyfield is a data engineers dream, politically I'd welcome something more personal. Time of birth/parents and other identifying information is on our birth cer…
You're reinventing a natural key with a bunch of identifiers which aren't stable enough.