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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2206385638,PR_kwDOAMm_X85qsSKm,8877,Don't allow overwriting indexes with region writes,2448579,closed,0,,,0,2024-03-25T18:13:19Z,2024-03-27T16:24:37Z,2024-03-27T16:24:35Z,MEMBER,,0,pydata/xarray/pulls/8877,"- [x] Closes #8589
- [x] Tests added
- [x] User visible changes (including notable bug fixes) are documented in `whats-new.rst`

cc @slevang 
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1471685307,I_kwDOAMm_X85XuCK7,7344,Disable bottleneck by default?,2448579,open,0,,,11,2022-12-01T17:26:11Z,2024-03-27T00:22:41Z,,MEMBER,,,,"### What is your issue?

Our choice to enable bottleneck by default results in quite a few issues about numerical stability and funny dtype behaviour: #7336, #7128, #2370, #1346 (and probably more)

Shall we disable it by default?

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