issue_comments: 678425306

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https://github.com/pydata/xarray/issues/4120#issuecomment-678425306 https://api.github.com/repos/pydata/xarray/issues/4120 678425306 MDEyOklzc3VlQ29tbWVudDY3ODQyNTMwNg== 14808389 2020-08-21T18:20:28Z 2020-08-21T18:20:28Z MEMBER

I just checked, and I think the issue can indeed be solved by replacing variable = self with variable = self.copy() (deep=False is the default, so no need to explicitly set it).

Also, I think _replace is a bit confusing: the name seems to imply a inplace operation, but it returns a new object without changing the original object.

 
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