10) If an event would cause a fork in the timeline, but the resulting timelines would be similar enough to immediately merge, the fork fails to happen. The timeline proceeds as if an appropriate merge had happened. However, since there was no actual merge, the timeline's position in metatime remains unchanged.
11) "Lateral" transmissions, in which information flows from one timeline into a meta-corresponding point in another timeline's spacetime, do not typically cause timeline forks. As long as neither timeline transfers information into what the transmitter perceives as the other timeline's subjective past, causality is guaranteed to remain linear, barring interference from a third timeline or within the transmitter's timeline.
12) If a timeline forks, everything within it is duplicated, *except* for objects whose worldlines intersect the timeline from an external source. Such objects are present in the timeline that does not contain the variant event, and absent from the new timeline. Such timelines are extraordinarily difficult to merge, and as such are difficult to fork in the first place.