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
371219949,MDExOlB1bGxSZXF1ZXN0MjIzNzE2MzQ3,2491,Dataset.copy docstring matches behavior,10374429,closed,0,,,3,2018-10-17T18:54:21Z,2018-10-23T05:59:53Z,2018-10-23T05:59:46Z,CONTRIBUTOR,,0,pydata/xarray/pulls/2491," - [ ] Closes #2490

This makes the docstring of Dataset.copy match the actual behavior. 

However, I noticed that DataArray.copy has the opposite behavior for the deep keyword. Is this intentional, or are they supposed to behave the same way?
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