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/3731#issuecomment-1234643971,https://api.github.com/repos/pydata/xarray/issues/3731,1234643971,IC_kwDOAMm_X85JlywD,3698640,2022-09-01T18:36:30Z,2022-09-01T18:36:30Z,CONTRIBUTOR,"FWIW I could definitely see use cases for allowing something like this... I have used cumbersome/ugly workarounds to work with variance-covariance matrices etc. So I'm not weighing in on the ""this should raise an error"" debate. I got briefly excited when I saw it *didn't* raise an error, until everything started unraveling 🙃 ","{""total_count"": 2, ""+1"": 1, ""-1"": 0, ""laugh"": 1, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,557257598 https://github.com/pydata/xarray/issues/3731#issuecomment-1234639080,https://api.github.com/repos/pydata/xarray/issues/3731,1234639080,IC_kwDOAMm_X85Jlxjo,3698640,2022-09-01T18:31:08Z,2022-09-01T18:31:08Z,CONTRIBUTOR,"ooh this is a fun one! came across this issue when we stumbled across a pendantic case writing tests (H/T @brews). I expected this to ""fail loudly in the constructor"" but it doesn't. note that currently AFAICT you cannot use positional slicing to achieve an intuitive result - the behavior seems more undefined/unpredictable ```python # setup import xarray as xr, pandas as pd, numpy as np da = xr.DataArray(np.arange(8).reshape(2, 2, 2), coords=[[0, 1], [0, 1], ['a', 'b']], dims=[""ni"", ""ni"", ""shh""]) ``` xarray seems to not know it has a problem: ```python In [4]: da Out[4]: array([[[0, 1], [2, 3]], [[4, 5], [6, 7]]]) Coordinates: * ni (ni) int64 0 1 * shh (shh) array([0, 1]) Coordinates: ni int64 0 * shh (shh) array([[[0, 1], [2, 3]], [[4, 5], [6, 7]]]) Coordinates: * ni (ni) int64 0 1 * shh (shh) array([0, 1]) Coordinates: ni int64 0 * shh (shh)