issue_comments: 670991386

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https://github.com/pydata/xarray/pull/2844#issuecomment-670991386 https://api.github.com/repos/pydata/xarray/issues/2844 670991386 MDEyOklzc3VlQ29tbWVudDY3MDk5MTM4Ng== 868027 2020-08-09T01:11:09Z 2020-08-09T01:11:09Z CONTRIBUTOR

Yes, my view is that things in ancillary_variables should stay in the attrs of their variable (DataArray) and not moved to coords. Currently this PR will remove the ancillary_variables from the attrs of the variables in a file which have it. This appears to break CF defined connection between associated variables (like uncertainty and QC). While the information isn't lost, I would need to look in encoding to get it. It looks like the first reply in #4215 also didn't like putting ancillary_variables in the coords.

What would be really awesome is some sort of variable proxy I could replace the string names with actual references/pointers to the correct DataArray in the Dataset. 

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