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/1042#issuecomment-344386680,https://api.github.com/repos/pydata/xarray/issues/1042,344386680,MDEyOklzc3VlQ29tbWVudDM0NDM4NjY4MA==,13906519,2017-11-14T20:24:49Z,2017-11-14T20:24:49Z,NONE,"@jhamman Yes, indeed. Sorry to spam this old issue. I misread this one - #757 is what'm seeing.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,181881219
https://github.com/pydata/xarray/issues/1042#issuecomment-344385473,https://api.github.com/repos/pydata/xarray/issues/1042,344385473,MDEyOklzc3VlQ29tbWVudDM0NDM4NTQ3Mw==,13906519,2017-11-14T20:20:38Z,2017-11-14T20:22:46Z,NONE,"I am seeing something similar, but maybe this is another issue (I'm on 0.10.0rc2)?

I do get a sorted string coordinate after a groupby...

My scenario is, that I have a dataset with a coord like this:

```
<xarray.DataArray 'pft' (pft: 13)>
array(['TeBE_tm', 'TeBE_itm', 'TeBE_itscl', 'TeBE_tscl', 'TeBS_tm', 'TeBS_itm',
       'TeE_s', 'TeR_s', 'TeNE', 'BBS_itm', 'BE_s', 'BS_s', 'C3G'],
      dtype='|S10')
Coordinates:
  * pft      (pft) |S10 'TeBE_tm' 'TeBE_itm' 'TeBE_itscl' 'TeBE_tscl' ...
```
Then I create a new coordinate that I use to aggregate:

```
pfts = ds.coords['pft'].values.tolist()
pfts_simplified = [remove(x) for x in pfts]

ds2['pft_agg'] = xr.full_like(ds['pft'], 0)
ds2['pft_agg'][:] = pfts_simplified
ds2_agg = ds2.groupby('pft_agg').sum(dim='pft', skipna=False)
result = ds2_agg.rename({'pft_agg': 'pft'})
```

Then in the end I have:
```
<xarray.DataArray 'pft' (pft: 8)>
array(['BBS', 'B_s', 'C3G', 'TeBE', 'TeBE_scl', 'TeBS', 'TeNE', 'Te_s'], dtype=object)
Coordinates:
  * pft      (pft) object 'BBS' 'B_s' 'C3G' 'TeBE' 'TeBE_scl' 'TeBS' 'TeNE' ...

```

Am I missing something?","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,181881219