html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/576#issuecomment-199381694,https://api.github.com/repos/pydata/xarray/issues/576,199381694,MDEyOklzc3VlQ29tbWVudDE5OTM4MTY5NA==,5635139,2016-03-21T17:03:29Z,2016-03-21T17:03:29Z,MEMBER,"This would be great to add - we just hit this (CC @justinkuosixty). 

> For now, a work around (at a slight cost in efficiency) is to use where followed by fillna.

This works, although if there are already `NaN`s, it requires another `where` to add those back
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