id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
267521588,MDU6SXNzdWUyNjc1MjE1ODg=,1646,Make passing a DataArray for the xarray.concat dim argument equivalent to passing a pandas Index,8268008,open,0,,,8,2017-10-23T02:09:58Z,2023-01-08T08:04:40Z,,NONE,,,,"Extending from #839, if I'm concatenating some DataArrays using concat,

```
print(xarray.concat(data, xarray.DataArray(['foo1', 'foo2', 'foo3', 'foo4', 'foo5'], name='stat'))
```

I get an unnamed dimension without coordinates.

```
<xarray.DataArray (dim_0: 5, index: 2)>
array([[ 24.841064,   0.750451],
       [ 24.841064,   0.750451],
       [ 19.062874,   0.796722],
       [ 14.9631  ,   0.354273],
       [ 14.9631  ,   0.354273]])
Coordinates:
  * index    (index) object 'Intercept' 'Lvl'
         (dim_0) <U3 'foo1' foo2' 'foo3' 'foo4' 'foo5'
Dimensions without coordinates: dim_0
```

Using a pandas.Index,

```
print(xarray.concat(data, pandas.Index(['foo1', 'foo2', 'foo3', 'foo4', 'foo5'], name='stat'))
```

```
<xarray.DataArray (stat: 5, index: 2)>
array([[ 14.9631  ,   0.354273],
       [ 19.982272,   0.555708],
       [ 14.974026,   0.60658 ],
       [ 24.841064,   0.750451],
       [ 24.841064,   0.750451]])
Coordinates:
  * index    (index) object 'Intercept' 'Lvl'
  * stat     (stat) object 'foo1' 'foo2' 'foo3' 'foo4' 'foo5'
```

I want the latter, not the former, but I expected the latter when using a DataArray.","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/1646/reactions"", ""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,issue