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- simplified the process of establishment and unestablishment of class management from a mapper perspective; class manager setup/teardown is now symmetric (ClassManager would never be fully de-associated previously). - class manager now unconditionally decorates __init__. this has a slight behavior change for an unmapped subclass of a mapped superclass, in that InstanceState creation corresponds to that of the superclass. This still doesn't allow unmapped subclasses to be usable in mapper situations, though.