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
222676855,MDU6SXNzdWUyMjI2NzY4NTU=,1378,"Many methods are broken (e.g., concat/stack/sortby) when using repeated dimensions",668201,open,0,,,17,2017-04-19T09:32:54Z,2023-08-30T07:36:37Z,,NONE,,,,"Concatenating DataArrays with repeated dimensions does not work.

```python
import xarray as xr  #xarray 0.8.2
from numpy import eye
A = xr.DataArray(eye(3), dims=['dim0', 'dim0'])
xr.concat([A, A], 'newdim')
```
fails with
```
[...]
ValueError: axes don't match array
```","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/1378/reactions"", ""total_count"": 2, ""+1"": 2, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,issue