issue_comments: 514004558

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https://github.com/pydata/xarray/issues/3158#issuecomment-514004558 https://api.github.com/repos/pydata/xarray/issues/3158 514004558 MDEyOklzc3VlQ29tbWVudDUxNDAwNDU1OA== 17169544 2019-07-23T00:26:14Z 2019-07-23T00:26:14Z CONTRIBUTOR

A related question - concat_dim is a required argument in the parent function combine_nested (and therefore required here when combine='nested'). But as None is a valid input, wouldn't it make more sense as an optional argument?

 
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