issue_comments: 855286432

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https://github.com/pydata/xarray/issues/4821#issuecomment-855286432 https://api.github.com/repos/pydata/xarray/issues/4821 855286432 MDEyOklzc3VlQ29tbWVudDg1NTI4NjQzMg== 2448579 2021-06-05T19:41:34Z 2021-06-05T19:41:34Z MEMBER

I think 2 and 3 become really confusing with swap_dims (for e.g.) So my vote is for 1. In all three cases, the solution to this issue is to suggest passing lists in the error message?

 
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