issue_comments: 280083096

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https://github.com/pydata/xarray/issues/1270#issuecomment-280083096 https://api.github.com/repos/pydata/xarray/issues/1270 280083096 MDEyOklzc3VlQ29tbWVudDI4MDA4MzA5Ng== 1217238 2017-02-15T17:43:31Z 2017-02-15T17:43:31Z MEMBER

I see no reason why this shouldn't work, so my guess is that this could be fixed pretty easily. We certainly don't have any tests for this right now, though.

My first step would be to drop into a debugger and figure out why the PeriodIndex is getting converted into as base Index when put into a Series in xarray's GroupBy.__init__.

 
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