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This PR adds another useful simplification when rendering constraint sets: `T = int` instead of `T = int ∧ T ≠ str`. (The "smaller" constraint `T = int` implies the "larger" constraint `T ≠ str`. Constraint set clauses are intersections, and if one constraint in a clause implies another, we can throw away the "larger" constraint.) While we're here, we also normalize the bounds of a constraint, so that we equate e.g. `T ≤ int | str` with `T ≤ str | int`, and change the ordering of BDD variables so that all constraints with the same typevar are ordered adjacent to each other. Lastly, we also add a new `display_graph` helper method that prints out the full graph structure of a BDD. --------- Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com> |
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