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/6976#issuecomment-1235533796,https://api.github.com/repos/pydata/xarray/issues/6976,1235533796,IC_kwDOAMm_X85JpL_k,4160723,2022-09-02T13:53:15Z,2022-09-02T13:53:15Z,MEMBER,"Xarray passes the label indexers to the underlying pandas index:

```python
import pandas as pd

# ""x"" coordinate index
idx = pd.Index([2, 1, 0, 3, 5])

# da.sel(x=slice(2, 3)) does this:
idx.slice_indexer(2, 3)
# which returns slice(0, 4, None)

# da.sel(x=[2, 3]) does this:
idx.get_indexer([2, 3])
# which returns array([0, 3])
```

> What might be possible is to warn if selecting with a slice and the index is not monotonic increasing or decreasing.

Is it always desirable? Asked differently, are there cases where one intentionally wants to select with a slice a non monotonic index? If yes, a warning might be annoying.

Maybe this could be clarified in the docs too?


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