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**Kind:** documentation / bug fix / feature / performance / infrastructure.


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Fixes / closes #????


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- [ ] Added / updated test-suite
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- [ ] Corresponding documentation was added / updated (including any warning and error messages added / removed / modified).
- [ ] Entry added in the changelog (see https://github.com/coq/coq/tree/master/doc/changelog#unreleased-changelog for details).
