issues: 166441031

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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
166441031 MDU6SXNzdWUxNjY0NDEwMzE= 907 unstack() treats string coords as objects 6213168 closed 0     7 2016-07-19T21:33:28Z 2022-09-27T12:11:36Z 2022-09-27T12:11:35Z MEMBER      

unstack() should be smart enough to recognise that all labels in a coord are strings, and convert them to numpy strings. This is particularly relevant e.g. if you want to dump the xarray to netcdf and then read it with a non-python library.

``` python import xarray

a = xarray.DataArray([[1,2],[3,4]], dims=['x', 'y'], coords={'x': ['x1', 'x2'], 'y': ['y1', 'y2']}) a ```

<xarray.DataArray (x: 2, y: 2)> array([[1, 2], [3, 4]]) Coordinates: * y (y) <U2 'y1' 'y2' * x (x) <U2 'x1' 'x2'

python a.stack(s=['x', 'y']).unstack('s')

<xarray.DataArray (x: 2, y: 2)> array([[1, 2], [3, 4]]) Coordinates: * x (x) object 'x1' 'x2' * y (y) object 'y1' 'y2'

 
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