Added flushing to attribute caches when an typed object is deleted. This fixes isse 295, but keeping that open for a little longer to see if some other solution can be devised.

src/typeclasses/models.py

@@ -826,6 +826,14 @@ class TypedObject(SharedMemoryModel):
                         if any(("%s.%s" % (_GA(cls,"__module__"), _GA(cls,"__name__")) == typec for typec in typeclasses))))
 
 
+    def delete(self, *args, **kwargs):
+        """
+        Type-level cleanup
+        """
+        flush_attr_cache()
+        super(TypedObject, self).delete(*args, **kwargs)
+
+
     #
     # Object manipulation methods
     #