html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/4727#issuecomment-750926206,https://api.github.com/repos/pydata/xarray/issues/4727,750926206,MDEyOklzc3VlQ29tbWVudDc1MDkyNjIwNg==,10194086,2020-12-24T16:51:42Z,2020-12-24T19:28:23Z,MEMBER,"There seems to be a subtle difference between comparing `Dataset` and `DataArray`. 

`DataArray` compares `coords`:

https://github.com/pydata/xarray/blob/03d8d56c9b6d090f0de2475202368b08435eaeb5/xarray/core/dataarray.py#L2792

while `Dataset` compares `_variables`:

https://github.com/pydata/xarray/blob/03d8d56c9b6d090f0de2475202368b08435eaeb5/xarray/core/dataset.py#L1457-L1459

Thus once we compare `xarray.core.variable.IndexVariable` and once we compare `xarray.core.dataarray.DataArray` and the comparison takes different code paths...


```python
import xarray as xr
air = xr.tutorial.open_dataset(""air_temperature"")

type(air._variables[""lat""])
# xarray.core.variable.IndexVariable

type(air.air.coords[""lat""])
# xarray.core.dataarray.DataArray
```

---
edit: typo
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