Yes it is important to have validation for anything coming in from outside (json, the database, etc). This is done by creating a map with the valid enum values

Yes it is important to have validation for anything coming in from outside (json, the database, etc). This is done by creating a map with the valid enum values and checking at runtime. This compile time solution wouldn't have worked for validating enums sent in json anyway, it's purely a defense mechanism against library users trying to cast arbitrary values to a package type.