user/id.go
func NextUID() (int, error) {
	db, uid, err := nextUID(false)
	db.close()
	return uid, err
}
func NextUID() (int, error) {
	db, uid, err := nextUID(false)
	db.close()
	return uid, err
}
func NextUID ( ) ( int , error ) { db , uid , err := nextUID ( false ) db . close ( ) return uid , err }
// NextUID returns the next free user id to use.
NextUID returns the next free user id to use .