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
919595236,MDExOlB1bGxSZXF1ZXN0NjY4ODk3OTc0,5464,Allow plotting categorical data,14371165,closed,0,,,3,2021-06-12T15:51:34Z,2021-07-18T21:19:21Z,2021-06-21T17:45:39Z,MEMBER,,0,pydata/xarray/pulls/5464,"<!-- Feel free to remove check-list items aren't relevant to your change -->

- [x] Closes #4260
- [x] Tests added
- [x] Passes `pre-commit run --all-files`
- [x] User visible changes (including notable bug fixes) are documented in `whats-new.rst`


```python
a = xr.DataArray(
    [0, 1, 2],
    dims=(""dim_1""),
    coords=dict(dim_1=([""dim_1""], [""u"", ""v"", ""w""])),
)
a.plot()
```
![image](https://user-images.githubusercontent.com/14371165/121782053-0a23e180-cba8-11eb-9524-46bfe8c94b35.png)


```python
a = xr.DataArray(
    [[0, 1, 2], [3, 4, 5]],
    dims=(""dim_0"", ""dim_1""),
    coords=dict(dim_0=([""dim_0""], [0, 1]), dim_1=([""dim_1""], [""u"", ""v"", ""w""])),
)
a.plot()
```
![image](https://user-images.githubusercontent.com/14371165/121781955-89fd7c00-cba7-11eb-8032-9b562f288621.png)
","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/5464/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull
925664972,MDExOlB1bGxSZXF1ZXN0Njc0MDg1Mjk3,5502,Use integer type hints in chunk functions ,14371165,closed,0,,,7,2021-06-20T19:18:58Z,2021-07-02T16:07:43Z,2021-06-21T07:10:32Z,MEMBER,,0,pydata/xarray/pulls/5502,"Attempt to fix errors found in #5365. I've changed it to integers because when does it ever make sense to input 1.5 or a complex number? It will always be forced to integers anyway: https://github.com/dask/dask/blob/8aea537d925b794a94f828d35211a5da05ad9dce/dask/array/core.py#L2815

Integers don't work with Numbers:
```
xarray/core/computation.py:1576: error: Dict entry 0 has incompatible type ""Hashable"": ""int""; expected ""Hashable"": ""Union[None, Number, str, Tuple[Number, ...]]""  [dict-item]
xarray/core/computation.py:1576: error: Dict entry 0 has incompatible type ""Hashable"": ""int""; expected ""Hashable"": ""Union[None, Number, Tuple[Number, ...]]""  [dict-item]
xarray/core/computation.py:1536: error: Dict entry 0 has incompatible type ""Hashable"": ""int""; expected ""Hashable"": ""Union[None, Number, str, Tuple[Number, ...]]""  [dict-item]
```

Floats don't work with Numbers:
```
xarray/core/computation.py:1536: error: Dict entry 0 has incompatible type ""Hashable"": ""int""; expected ""Hashable"": ""Union[None, Number, str, Tuple[Number, ...]]""  [dict-item]
xarray/core/computation.py:1578: error: Dict entry 0 has incompatible type ""Hashable"": ""float""; expected ""Hashable"": ""Union[None, Number, str, Tuple[Number, ...]]""  [dict-item]
xarray/core/computation.py:1578: error: Dict entry 0 has incompatible type ""Hashable"": ""float""; expected ""Hashable"": ""Union[None, Number, Tuple[Number, ...]]""  [dict-item]
```
This workaround seems related to: https://github.com/python/mypy/issues/3186

- [ ] Closes #xxxx
- [ ] Tests added
- [ ] Passes `pre-commit run --all-files`
- [ ] User visible changes (including notable bug fixes) are documented in `whats-new.rst`
- [ ] New functions/methods are listed in `api.rst`
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