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
497732305,MDExOlB1bGxSZXF1ZXN0MzIwODA1ODA1,3338,Add groupby.dims & Fix groupby reduce for DataArray,2448579,closed,0,,,0,2019-09-24T14:39:02Z,2019-10-10T18:42:49Z,2019-10-10T18:23:22Z,MEMBER,,0,pydata/xarray/pulls/3338,"<!-- Feel free to remove check-list items aren't relevant to your change -->

 - [x] Closes #3337, xref #1764
 - [x] Tests added
 - [x] Passes `black . && mypy . && flake8`
 - [x] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API
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