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/830#issuecomment-211408801,https://api.github.com/repos/pydata/xarray/issues/830,211408801,MDEyOklzc3VlQ29tbWVudDIxMTQwODgwMQ==,1217238,2016-04-18T14:42:34Z,2016-04-18T14:42:34Z,MEMBER,"I agree, this would be great! See https://github.com/pydata/xarray/issues/324 for more discussion -- I proposed calling this `group_over` but it's essentially the same idea.

It should be _relatively_ straightforward to implement once finish #818, but it will also require support for multiple groupby arguments, beyond just support for multi-dimensional arguments.
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