id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
2017285297,PR_kwDOAMm_X85gtObP,8491,Warn on repeated dimension names during construction,35968931,closed,0,,,13,2023-11-29T19:30:51Z,2023-12-01T01:37:36Z,2023-12-01T00:40:18Z,MEMBER,,0,pydata/xarray/pulls/8491,"<!-- Feel free to remove check-list items aren't relevant to your change -->

- [x] Closes #2226 and #1499 by forbidding those situations (but we should leave #3731 open as the ""official"" place to discuss supporting repeated dimensions
- [x] Tests added
- [x] User visible changes (including notable bug fixes) are documented in `whats-new.rst`
- [ ] ~~New functions/methods are listed in `api.rst`~~
","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/8491/reactions"", ""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull
592312709,MDExOlB1bGxSZXF1ZXN0Mzk3MzIwNzgx,3925,sel along 1D non-index coordinates,35968931,closed,0,,,13,2020-04-02T02:23:56Z,2022-09-07T14:31:58Z,2022-09-07T14:31:58Z,MEMBER,,0,pydata/xarray/pulls/3925,"As a user, I find not being able to select along one-dimensional non-dimensional coordinates actually comes up fairly often. I think it's quite common to use multiple coordinates to be able to choose between plotting in different coordinate systems (or units) easily.

I've tried to close #2028 in the simplest (but also least efficient) way which was suggested by @shoyer ([suggestion 1 here](https://github.com/pydata/xarray/issues/934#issuecomment-236960237)).

This should be temporary anyway: it will get superseded by the [explicit indexes refactor](https://github.com/pydata/xarray/issues/1603). If there is another approach which would achieve the same functionality as this PR but actually bring us closer to #1603 then I would be happy to take a stab at that instead.

I don't really know what to do about the [failing test](https://github.com/pydata/xarray/blob/b3bafeefbd6e6d70bce505ae1f0d9d5a2b015089/xarray/tests/test_dataset.py#L3632) in groupby arithmetic - I think it's [caused here](https://github.com/pydata/xarray/blob/b3bafeefbd6e6d70bce505ae1f0d9d5a2b015089/xarray/core/groupby.py#L497) but I'm not sure what to replace the triple error type catching (?!) with.

 - [x] Closes #2028
 - [x] Tests added
 - [ ] Passes `isort -rc . && black . && mypy . && flake8`
 - [ ] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API
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