issue_comments: 609039388

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https://github.com/pydata/xarray/issues/3931#issuecomment-609039388 https://api.github.com/repos/pydata/xarray/issues/3931 609039388 MDEyOklzc3VlQ29tbWVudDYwOTAzOTM4OA== 10194086 2020-04-04T14:46:28Z 2020-04-04T14:46:28Z MEMBER

Ah yes, because bottom_up has the same lenght in the two ds.

Thus, you could also remove the exclude_dims from the signature (but doesen't hurt either). 

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