issue_comments: 773693380

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https://github.com/pydata/xarray/issues/3891#issuecomment-773693380 https://api.github.com/repos/pydata/xarray/issues/3891 773693380 MDEyOklzc3VlQ29tbWVudDc3MzY5MzM4MA== 14808389 2021-02-05T00:25:16Z 2021-02-05T00:25:16Z MEMBER

if I remember correctly, we decided to allow passing a user-provided function to combine_attrs and to extend keep_attrs to accept a bool, a str or a function.

Something to keep in mind is that not all strategies make sense for operations that involve only a single variable, like isnull, but I guess for those all string options except drop mean "keep the attributes".

 
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