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/2982#issuecomment-495275980,https://api.github.com/repos/pydata/xarray/issues/2982,495275980,MDEyOklzc3VlQ29tbWVudDQ5NTI3NTk4MA==,2448579,2019-05-23T15:49:04Z,2019-05-23T15:49:32Z,MEMBER,"Yes looks like `_add_colorbar` in `plot/utils.py` works around this :) in this line:
```
cbar_kwargs.setdefault('extend', cmap_params['extend'])
```

Now I'm confused why your initial statement didn't work.

It's a little funny because `_determine_cmap_params` autosets `extend` based on `vmin`, `vmax`. I think you should be able to modify `_process_cmap_...` to do the right thing so that `cmap_params` needn't be provided to `_add_colorbar` in `_plot2d`.

I agree `extend` is really a `cbar_kwarg`. Can you send in a PR to fix this?

By do the right thing I mean move `extend` to `cbar_kwargs`","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,447361330
https://github.com/pydata/xarray/issues/2982#issuecomment-495011402,https://api.github.com/repos/pydata/xarray/issues/2982,495011402,MDEyOklzc3VlQ29tbWVudDQ5NTAxMTQwMg==,14314623,2019-05-22T23:28:41Z,2019-05-22T23:28:41Z,CONTRIBUTOR,"If I understand correctly then it gets piped through `cmap_kwargs`, which seems odd to me. Do you agree that this is a bug? Or am I missing a case where it would be preferable to pass `extend` directly to `plot.contourf`?","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,447361330
https://github.com/pydata/xarray/issues/2982#issuecomment-494996134,https://api.github.com/repos/pydata/xarray/issues/2982,494996134,MDEyOklzc3VlQ29tbWVudDQ5NDk5NjEzNA==,2448579,2019-05-22T22:22:02Z,2019-05-22T22:22:02Z,MEMBER,If you pass `extend='neither'` directly it should work. There is a `_process_cmap_params_cbar_kwargs` in `plot/utils.py` (I think) that deals with this.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,447361330