The final user-settable property is the itype of the object being created. The meaning of the itype is usually defined by the user, although the system has some types defined, such as metric, connection, and most functions set the itype of their output to something meaningful. Because some functions check the itype of their argument, mkobj() causes the user-entered value to be mapped to the native case of the underlying lisp system. Therefore, entering itype parameters in mixed case is pointless.