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
221845134,MDU6SXNzdWUyMjE4NDUxMzQ=,1373,Dataset.combine_first() coordinates attribute,9844249,closed,0,,,2,2017-04-14T16:46:02Z,2019-04-14T23:22:23Z,2019-04-14T23:22:23Z,NONE,,,,"Hi guys!

Thanks for the great job you are doing!

Here is a possible bug in the `Dataset.combine_first()` method (I'm using xarray 0.9.2 with Python 3.5.2). 

The Dataset/DataArray coordinates are correctly treated if specified without commas, e.g. (as seen with ncdump):  ``MyVar:coordinates = ""alt lat lon"" ; ``.  In this case _lon, lat_, and _alt_ are recognized as the Dataset's (and its DataArrays') `.coords`.

However, the `Dataset.combine_first() `method only treats coordinates correctly if specified with commas, i.e., `MyVar:coordinates = ""alt, lat, lon""`.  

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