issue_comments: 310489331

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https://github.com/pydata/xarray/issues/1463#issuecomment-310489331 https://api.github.com/repos/pydata/xarray/issues/1463 310489331 MDEyOklzc3VlQ29tbWVudDMxMDQ4OTMzMQ== 1217238 2017-06-22T20:12:10Z 2017-06-22T20:12:10Z MEMBER

This seems like a bug.

I suspect the problem is in Variable.copy on these lines (which should probably just be removed). Coordinates store their data in pandas.Index objects, which are supposed to be immutable. But apparently that's not necessarily the case.

 
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