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
1699099029,PR_kwDOAMm_X85P8IoD,7824,Improve concat performance,14371165,closed,0,,,1,2023-05-07T14:54:06Z,2023-06-02T14:36:11Z,2023-06-02T14:36:11Z,MEMBER,,0,pydata/xarray/pulls/7824,"* Don't use python for loops for possibly large coords. Rather create a np array once then filter out bad data.
* DuckArrayModule is slightly slow, so cache the first import in a dict instead to speed up later calls.
* Add more typing to be more confident that inputs are valid and then remove redundant checks and conversions.

- [x] Requires #7843 
- [x] Requires #7844.
- [x] Requires #7858
- [x] Closes #7833
- [x] Tests added
- [x] User visible changes (including notable bug fixes) are documented in `whats-new.rst`

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