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
585868107,MDExOlB1bGxSZXF1ZXN0MzkyMTExMTI4,3877,"Control attrs of result in `merge()`, `concat()`, `combine_by_coords()` and `combine_nested()`",3958036,closed,0,,,7,2020-03-23T01:32:59Z,2020-04-05T20:44:47Z,2020-03-24T20:40:18Z,CONTRIBUTOR,,0,pydata/xarray/pulls/3877,"`combine_attrs` argument for `merge()`, `concat()`, `combine_by_coords()` and `combine_nested()` controls what attributes the result is given. Defaults maintain the current behaviour. Possible values (named following `compat` arguments) are:
- 'drop': empty attrs on returned Dataset.
- 'identical': all attrs must be the same on every object.
- 'no_conflicts': attrs from all objects are combined, any that have the same name must also have the same value.
- 'override': skip comparing and copy attrs from the first dataset to the result.

<!-- Feel free to remove check-list items aren't relevant to your change -->

 - [x] Closes #3865 
 - [x] Tests added
 - [x] Passes `isort -rc . && black . && mypy . && flake8`
 - [ ] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API
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