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I think one thing that needs to be addressed is the implementation of time. Let me elaborate in a manner that everyone can relate to, movies.
There's the Back to the Future model, which states that for every change that is made from outside the timeline (time travel, whatnot) a new timeline is generated that branches off from the old timeline and events take place along that timeline, not affecting the prior timeline.
Then there's the Terminator model, that states that changes made in the past by outside influences creates a new future, directly altering future events and that timeline.
While we can't know which way time truly operates, having some frame of reference that adequately addresses observable behavior will point us in the right direction.
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