- added instance variable arg for interfacing with parameter interface. "arg" acts like a clientdata for type converter - added multiple parameter options handling to method "parameter" to obtain similar functionality from object parameters as from method parameters - added conveniance method "??" to test to indicated test that should fail with an error - added severy type converters to achieve same object type checking as in ::xotcl::is (these are currently in the regression test, should move finally into predefined.xotcl) - extended regression test