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
1874695065,I_kwDOAMm_X85vvZOZ,8125,failing tests with pandas  2.1,2448579,closed,0,,,10,2023-08-31T02:42:32Z,2023-09-15T13:12:02Z,2023-09-15T13:12:02Z,MEMBER,,,,"### What happened?

See  https://github.com/pydata/xarray/pull/8101

```
FAILED xarray/tests/test_missing.py::test_interpolate_pd_compat - ValueError: 'fill_value' is not a valid keyword for DataFrame.interpolate
FAILED xarray/tests/test_missing.py::test_interpolate_pd_compat_non_uniform_index - ValueError: 'fill_value' is not a valid keyword for DataFrame.interpolate
```

and this doctest
```
FAILED xarray/core/dataarray.py::xarray.core.dataarray.DataArray.to_unstacked_dataset
```
@pydata/xarray can someone take a look please?","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/8125/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed,13221727,issue
684930038,MDU6SXNzdWU2ODQ5MzAwMzg=,4372,Set `allow_rechunk=True` in `apply_ufunc`,2448579,closed,0,,,10,2020-08-24T20:02:50Z,2020-09-09T19:00:17Z,2020-09-09T19:00:17Z,MEMBER,,,,"<!-- Please include a self-contained copy-pastable example that generates the issue if possible.

Please be concise with code posted. See guidelines below on how to provide a good bug report:

- Craft Minimal Bug Reports: http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports
- Minimal Complete Verifiable Examples: https://stackoverflow.com/help/mcve

Bug reports that follow these guidelines are easier to diagnose, and so are often handled much more quickly.
-->

**What happened**:

`blockwise` calls `unify_chunks` by default but `apply_gufunc` does not; so we have a regression in `apply_ufunc` now that we've switched from `blockwise` to `apply_gufunc`.

**Minimal Complete Verifiable Example**:

```python
import operator

a = xr.DataArray(np.arange(10), dims=(""a"")).chunk({""a"": 2})
b = xr.DataArray(np.arange(10), dims=(""a"")).chunk({""a"": 4})

xr.apply_ufunc(operator.add, a, b, dask=""parallelized"", output_dtypes=[a.dtype]).compute()
```

raises
```
ValueError: Dimension `'__loopdim0__'` with different chunksize present
```

on master but works with 0.16.0

I think we need to do `dask_gufunc_kwargs.setdefault(""allow_rechunk"", True)`

If we want to avoid that, we'll need to go through a deprecation cycle.","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/4372/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed,13221727,issue
444520875,MDExOlB1bGxSZXF1ZXN0Mjc5MTY0MTQ2,2965,Don't set encoding attributes on bounds variables.,2448579,closed,0,,,10,2019-05-15T16:00:44Z,2019-06-25T00:24:46Z,2019-06-25T00:24:42Z,MEMBER,,0,pydata/xarray/pulls/2965,"Here's a proposed fix for #2436 and #2921. Ping @spencerkclark @mathause @klindsay28

1. Removes certain attributes from bounds variables on encode.
2. open_mfdataset: Sets encoding on variables based on encoding in first file.

 - [x] Closes #2921
 - [x] Tests added
 - [x] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API
","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/2965/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull
298481284,MDExOlB1bGxSZXF1ZXN0MTcwMTA4MjE1,1926,"Add x,y kwargs for plot.line().",2448579,closed,0,,,10,2018-02-20T06:04:35Z,2018-05-10T05:12:03Z,2018-03-05T22:14:46Z,MEMBER,,0,pydata/xarray/pulls/1926," - [x] Partially closes #575 
 - [x] Tests added
 - [x] Tests passed
 - [x] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API

### Description
`plot.line` now supports both 1D and 2D DataArrays as input. I've changed  some variable names to make code clearer:
   1. set `xplt`, `yplt` to be values that are passed to `ax.plot()`
   2. `xlabel`, `ylabel` are axes labels
   3. `xdim`, `ydim` are dimension names

### Example
This code
```z = np.arange(10)
da = xr.DataArray(np.cos(z), dims=['z'], coords=[z], name='f')

xy = [[None, None],
     [None, 'f'],
     [None, 'z'],
     ['f', None],
      ['z', None],
      ['z', 'f'],
      ['f', 'z']]

f, ax = plt.subplots(2,4)

for aa, (x,y) in enumerate(xy):
    da.plot(x=x, y=y, ax=ax.flat[aa])
    ax.flat[aa].set_title('x='+str(x)+ ' | '+'y='+str(y))
```

yields

![image](https://user-images.githubusercontent.com/2448579/36409515-ca2d6d9e-15c0-11e8-9d04-c7c741ac3d5d.png)

### Feedback requested

Should I refactor out the kwarg checking? ","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/1926/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull