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
970245117,MDExOlB1bGxSZXF1ZXN0NzEyMjIzNzc2,5704,Allow in-memory arrays with open_mfdataset,14371165,open,0,,,8,2021-08-13T09:50:26Z,2023-04-29T06:58:26Z,,MEMBER,,0,pydata/xarray/pulls/5704,"The docstring seems to imply that it's possible to get in-memory arrays:
https://github.com/pydata/xarray/blob/4bb9d9c6df77137f05e85c7cc6508fe7a93dc0e4/xarray/backends/api.py#L732

But it doesn't seem possible because of:
https://github.com/pydata/xarray/blob/4bb9d9c6df77137f05e85c7cc6508fe7a93dc0e4/xarray/backends/api.py#L899

This PR removes that `or` check, changes the default to `chunk={}`, and fixes the failing tests.

<!-- Feel free to remove check-list items aren't relevant to your change -->

- [x] Noticed in  #5689
- [ ] Closes #7792
- [x] Tests added
- [x] Passes `pre-commit run --all-files`
- [x] User visible changes (including notable bug fixes) are documented in `whats-new.rst`
","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/5704/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull
970234731,MDExOlB1bGxSZXF1ZXN0NzEyMjE0ODU4,5703,Use the same bool validator as other inputs for use_bottleneck in xr.set_options,14371165,closed,0,,,2,2021-08-13T09:36:03Z,2022-08-12T09:07:28Z,2021-08-13T13:41:42Z,MEMBER,,0,pydata/xarray/pulls/5703,Minor change to align with other booleans.,"{""url"": ""https://api.github.com/repos/pydata/xarray/issues/5703/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull
970208539,MDExOlB1bGxSZXF1ZXN0NzEyMTkxODEx,5702,Move docstring for xr.set_options to numpy style,14371165,closed,0,,,2,2021-08-13T09:05:56Z,2022-08-12T09:06:23Z,2021-08-19T22:27:39Z,MEMBER,,0,pydata/xarray/pulls/5702,"While trying to figure out which types are allowed in  #5678 I felt that the `set_options` docstring was rather hard to read. Moving it to typical numpy docstring style helped at least for me.
","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/5702/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull