Problems with overriding attribute in child class

Ticket is based on post http://groups.google.com/group/sqlalchemy/browse_thread/thread/5be8ca1088eb9833#

There is a problem with overriding attributes by parent class in its children classes.

It is probably because of dict _mapper_registry in sqlalchemy/orm/mapper.py line 652 which doesn't keep track of class order and sometimes _register_attribute is fired first for children and then for parents.

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