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common ancestor should return the youngest ancestor instead of the oldest one #2056
I think it would be useful to have a unit test of this. Can you write one in
I don't understand what you're saying here. The oldest common ancestor of two breadcrumbs will always be the root of the transition frontier, which is definitely not what it used to return. What is the change? Given this diagram
previously it returned the root if the branches were the same length, but you seem to have figured that out.