issue_comments: 451501740

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https://github.com/pydata/xarray/issues/2647#issuecomment-451501740 https://api.github.com/repos/pydata/xarray/issues/2647 451501740 MDEyOklzc3VlQ29tbWVudDQ1MTUwMTc0MA== 291576 2019-01-04T16:55:40Z 2019-01-04T16:55:40Z CONTRIBUTOR

To be more explicit, the issue is that concat_dim == _CONCAT_DIM_DEFAULT is ill-advised because the type of concat_dim is not guaranteed to be a scalar. In fact, the elif of that area of code in api.py explicitly tests if concat_dim is or is not a list.

 
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