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marcin-rzeznicki
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This PR introduces a generic three-way zipper merge:
It also introduces policy-driven semantics: fully generic over
MergePolicy(structure) andValuePolicy(values); supportsJoin,Meet, andSubtractwith no special-casing in the engine.In short: this lifts the zipper merge from binary to ternary without sacrificing performance, while keeping algebraic semantics cleanly encapsulated in policies.
Note to the reviewers
Please review #33 first, in case you haven't done it yet