The domains in HierarchicalPathFinder can be compared to find disjoint areas. For example islands on a water map will belong to different domains. Use these domains in path searches to allow us to bail out early if a path is impossible, e.g. trying to path between different islands. Keeping the domains updated via the RebuildDomains method adds some cost to the average path search, but that savings from path searches that can bail early pays for this many times over.
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