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Features
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- Add new reporting callbacks `adding_requirements`, `adding_candidate`, and `replacing_candidate` to report progress in requirement pinning. `2 <https://github.com/sarugaku/resolvelib/issues/2>`_
Bug Fixes
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- Fix missing edges in the resolved dependency graph caused by incorrectly copying stale constraint and parent-child information. `5 <https://github.com/sarugaku/resolvelib/issues/5>`_