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- docs about backref cascade - Another new flag on relationship(), cascade_backrefs, disables the "save-update" cascade when the event was initiated on the "reverse" side of a bidirectional relationship. This is a cleaner behavior so that many-to-ones can be set on a transient object without it getting sucked into the child object's session, while still allowing the forward collection to cascade. We *might* default this to False in 0.7.