Must create heaptypes with unicode names.

Python/errors.c

@@ -575,7 +575,7 @@ PyErr_NewException(char *name, PyObject *base, PyObject *dict)
 			goto failure;
 	}
 	/* Create a real new-style class. */
-	result = PyObject_CallFunction((PyObject *)&PyType_Type, "sOO",
+	result = PyObject_CallFunction((PyObject *)&PyType_Type, "UOO",
 				       dot+1, bases, dict);
   failure:
 	Py_XDECREF(bases);