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
1830038411,PR_kwDOAMm_X85W2FcN,8034,sort when encoding coordinates for deterministic outputs,3383837,closed,0,,,0,2023-07-31T21:16:31Z,2023-08-03T16:27:28Z,2023-08-03T16:27:27Z,CONTRIBUTOR,,0,pydata/xarray/pulls/8034,"- [x] Closes #8026
- [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`~~

The PR changes `conventions._encode_coordinates` to add `sorted` during the creation of ""coordinates"" strings *de novo*. It does not touch user-specified coordinates attributes or encodings.

The PR adds a test, but also changes two pre-existing tests that allowed for non-deterministic ordering of the coordinates string.

In reviewing the netCDF data model and CF convenstions, I confirmed that there is no requirement on the ordering of names in the coordinates attribute. I also learned that the global coordinates attribute created by XArray for non-dimension coordinates that are not associated with a variable is not compliant with CF conventions, as was [discussed in 2014](https://mailman.cgd.ucar.edu/pipermail/cf-metadata/2014/007571.html). In 2021, CF-Conventions 1.9 added [""Domain Variables""](http://cfconventions.org/cf-conventions/cf-conventions.html#domain-variables), which appear to provide a CF compliant way to handle this situation. I will likely open an enhancement issue to weigh making that change.","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/8034/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull
1503973868,PR_kwDOAMm_X85F1kOI,7393,Preserve original dtype when accessing MultiIndex levels,3383837,closed,0,,,1,2022-12-20T04:34:24Z,2022-12-24T04:37:45Z,2022-12-24T00:07:42Z,CONTRIBUTOR,,0,pydata/xarray/pulls/7393,"- [x] Closes #7250 
- [x] Tests added
- [x] User visible changes (including notable bug fixes) are documented in `whats-new.rst`

Just what @benbovy said to do in #7250. Thank you!","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/7393/reactions"", ""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull