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
388977754,MDExOlB1bGxSZXF1ZXN0MjM3MTAyNjYz,2595,Close files when CachingFileManager is garbage collected,1217238,closed,0,,,5,2018-12-09T01:53:50Z,2018-12-23T20:11:35Z,2018-12-23T20:11:32Z,MEMBER,,0,pydata/xarray/pulls/2595,"This frees users from needing to worry about this.

Using `__del__` turned up to be easier than  using weak references.

 - [x] Closes #2560 
 - [x] Closes #2614
 - [x] Tests added
 - [x] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new AP
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