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Immediately
+ - needs/hates/follow API ugliness
+
+ - Topology crap is kinda messed up
+ - Atom should be a topology, shouldn't it?
+
- do Forest/Tree still need a Region?
+ - reconsider the degree of genericization
+ - GraphViz stuff pollutes the API...
- Forest needs a "manual access" API
- the unwrap bit in Forest makes it really hard to expose an API for forests