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This PR contains a few performance fixes all aimed at preserving sharing under binders/renaming. On
master, it is possible to constructTerms thatevaluatein quadratic or even exponential time even with the new caching machinery #745. With these fixes, a much larger class ofTerms with binders can be analyzed or transformed in linear time, e.g.test_evaluate_dag_under_binders_no_exponential_blowup.I'm pretty sure what's here is correct but I'm not sure it's minimal. I may break this into separate PRs once I work out remaining kinks.