issue_comments: 262557502

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https://github.com/pydata/xarray/issues/1132#issuecomment-262557502 https://api.github.com/repos/pydata/xarray/issues/1132 262557502 MDEyOklzc3VlQ29tbWVudDI2MjU1NzUwMg== 3404817 2016-11-23T16:06:46Z 2016-11-23T16:06:46Z CONTRIBUTOR

Great, safe_cast_to_index works nicely (it passes my test). I added the change to the existing PR.

Do we need to add more groupby tests to make sure the solution is safe for other cases (e.g. other data types)?

 
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