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- declarative now accepts mixin classes directly, as a means to provide common functional and column-based elements on all subclasses, as well as a means to propagate a fixed set of __table_args__ or __mapper_args__ to subclasses. For custom combinations of __table_args__/__mapper_args__ from an inherited mixin to local, descriptors can now be used. New details are all up in the Declarative documentation. Thanks to Chris Withers for putting up with my strife on this. [ticket:1707]