issue_comments: 573964243

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https://github.com/pydata/xarray/issues/3470#issuecomment-573964243 https://api.github.com/repos/pydata/xarray/issues/3470 573964243 MDEyOklzc3VlQ29tbWVudDU3Mzk2NDI0Mw== 2448579 2020-01-14T02:06:30Z 2020-01-14T02:06:30Z MEMBER

I think what we probably want to do is mark variables used in indexes as having immutable data in xarray's data model, and raise an error for attempts to modify them in-place.

How do I implement this?

 
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