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`
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