I used kysely-codegen and it spit out something like the following:

export type Int8 = ColumnType<
  string,
  bigint | number | string,
  bigint | number | string
>;

export interface UserTable {
  ...
  phoneOneCountryId: Generated<Int8>;
 ...
}

Which I then wrap:

export type NewUser = Insertable<UserTable>;

However when I go to use like so:

const testNewUser: NewUser = {
      ...
      phoneOneCountryId: 20,
      ...
    };

I get compilation error:
Type 'number' is not assignable to type 'Int8'.ts(2322)

If I understand how codegen set up Int8 correctly with ColumnType then it passed
bigint | number | string,
as the InsertType (middle arg). So I wouldn’t expect this to error – what am I missing here?