issue_comments: 612141362

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https://github.com/pydata/xarray/pull/3862#issuecomment-612141362 https://api.github.com/repos/pydata/xarray/issues/3862 612141362 MDEyOklzc3VlQ29tbWVudDYxMjE0MTM2Mg== 29104956 2020-04-10T17:47:14Z 2020-04-10T17:47:14Z NONE

That's exactly what this change does, making assignment to IndexVariable.values an error.

Sorry, I got a bit criss-crossed between this PR and the thread in #3470.

In light of https://github.com/pydata/xarray/issues/3470#issuecomment-566214653 it seems like the next best thing would be to given assign_coords the optional ability to update the DataArray/DataSet in-place. Thoughts? 

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