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
2066510805,I_kwDOAMm_X857LHPV,8589,"Don't overwrite indexes for region writes, always",2448579,closed,0,,,2,2024-01-04T23:52:18Z,2024-03-27T16:24:37Z,2024-03-27T16:24:36Z,MEMBER,,,,"### What happened?

Currently we don't overwrite indexes when `region=""auto""`
https://github.com/pydata/xarray/blob/e6ccedb56ed4bc8d0b7c1f16ab325795330fb19a/xarray/backends/api.py#L1769-L1770

I propose we do this for all region writes and completely disallow modifying indexes with a region write.

This would match the `map_blocks` model, where all indexes are specified in the `template` and no changes by the mapped function are allowed.
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2065788086,PR_kwDOAMm_X85jOw74,8585,Enable Zarr V3 tests in all CI runs.,2448579,closed,0,,,0,2024-01-04T14:45:44Z,2024-01-05T17:53:08Z,2024-01-05T17:53:06Z,MEMBER,,0,pydata/xarray/pulls/8585,"🤦🏾‍♂️ 

Spotted in https://github.com/pydata/xarray/pull/8460

Builds on #8586 ","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/8585/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull
2065809896,PR_kwDOAMm_X85jO1oX,8586,Bump min deps.,2448579,closed,0,,,0,2024-01-04T14:59:05Z,2024-01-05T16:13:16Z,2024-01-05T16:13:14Z,MEMBER,,0,pydata/xarray/pulls/8586,"
- [x] Closes #8581
- [x] User visible changes (including notable bug fixes) are documented in `whats-new.rst`","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/8586/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull
2066129022,PR_kwDOAMm_X85jP678,8587,Silence another warning in test_backends.py,2448579,closed,0,,,1,2024-01-04T18:20:49Z,2024-01-05T16:13:05Z,2024-01-05T16:13:03Z,MEMBER,,0,pydata/xarray/pulls/8587,"Using 255 as fillvalue for int8 arrays will not be allowed any more. Previously this overflowed to -1. Now specify that instead.

On numpy 1.24.4
```
>>> np.array([255], dtype=""i1"")
    DeprecationWarning: NumPy will stop allowing conversion of out-of-bound Python integers to integer arrays.  The conversion of 255 to int8 will fail in the future.

array([-1], dtype=int8)
```
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