LPDictionary: Make it safe to copy dictionaries #37866
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<!-- ^ Please provide a concise and informative title. --> <!-- ^ Don't put issue numbers in the title, do this in the PR description below. --> <!-- ^ For example, instead of "Fixes sagemath#12345" use "Introduce new method to calculate 1 + 2". --> <!-- v Describe your changes below in detail. --> <!-- v Why is this change required? What problem does it solve? --> <!-- v If this PR resolves an open issue, please link to it here. For example, "Fixes sagemath#12345". --> Dictionaries are mutable, and copying them using `copy` results in dictionaries that share internal objects, which causes unwelcome surprises. - rebased from sagemath#31308 Author: @mkoeppe, @ComboProblem Fixes sagemath#31308. ### 📝 Checklist <!-- Put an `x` in all the boxes that apply. --> - [x] The title is concise and informative. - [ ] The description explains in detail what this PR is about. - [x] I have linked a relevant issue or discussion. - [ ] I have created tests covering the changes. - [ ] I have updated the documentation and checked the documentation preview. ### ⌛ Dependencies <!-- List all open PRs that this PR logically depends on. For example, --> <!-- - sagemath#12345: short description why this is a dependency --> <!-- - sagemath#34567: ... --> URL: sagemath#37866 Reported by: Matthias Köppe Reviewer(s): Kwankyu Lee, Matthias Köppe
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<!-- ^ Please provide a concise and informative title. --> <!-- ^ Don't put issue numbers in the title, do this in the PR description below. --> <!-- ^ For example, instead of "Fixes sagemath#12345" use "Introduce new method to calculate 1 + 2". --> <!-- v Describe your changes below in detail. --> <!-- v Why is this change required? What problem does it solve? --> <!-- v If this PR resolves an open issue, please link to it here. For example, "Fixes sagemath#12345". --> Dictionaries are mutable, and copying them using `copy` results in dictionaries that share internal objects, which causes unwelcome surprises. - rebased from sagemath#31308 Author: @mkoeppe, @ComboProblem Fixes sagemath#31308. ### 📝 Checklist <!-- Put an `x` in all the boxes that apply. --> - [x] The title is concise and informative. - [ ] The description explains in detail what this PR is about. - [x] I have linked a relevant issue or discussion. - [ ] I have created tests covering the changes. - [ ] I have updated the documentation and checked the documentation preview. ### ⌛ Dependencies <!-- List all open PRs that this PR logically depends on. For example, --> <!-- - sagemath#12345: short description why this is a dependency --> <!-- - sagemath#34567: ... --> URL: sagemath#37866 Reported by: Matthias Köppe Reviewer(s): Kwankyu Lee, Matthias Köppe
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<!-- ^ Please provide a concise and informative title. --> <!-- ^ Don't put issue numbers in the title, do this in the PR description below. --> <!-- ^ For example, instead of "Fixes sagemath#12345" use "Introduce new method to calculate 1 + 2". --> <!-- v Describe your changes below in detail. --> <!-- v Why is this change required? What problem does it solve? --> <!-- v If this PR resolves an open issue, please link to it here. For example, "Fixes sagemath#12345". --> Dictionaries are mutable, and copying them using `copy` results in dictionaries that share internal objects, which causes unwelcome surprises. - rebased from sagemath#31308 Author: @mkoeppe, @ComboProblem Fixes sagemath#31308. ### 📝 Checklist <!-- Put an `x` in all the boxes that apply. --> - [x] The title is concise and informative. - [ ] The description explains in detail what this PR is about. - [x] I have linked a relevant issue or discussion. - [ ] I have created tests covering the changes. - [ ] I have updated the documentation and checked the documentation preview. ### ⌛ Dependencies <!-- List all open PRs that this PR logically depends on. For example, --> <!-- - sagemath#12345: short description why this is a dependency --> <!-- - sagemath#34567: ... --> URL: sagemath#37866 Reported by: Matthias Köppe Reviewer(s): Kwankyu Lee, Matthias Köppe
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Dictionaries are mutable, and copying them using
copyresults in dictionaries that share internal objects, which causes unwelcome surprises.Author: @mkoeppe, @ComboProblem
Fixes #31308.
📝 Checklist
⌛ Dependencies