The question: do you want to support pathlib objects arriving at ds.encoding['source']?

What happened: If you pass a pathlib object to open_[mf]dataset, the ds.encoding['source'] is not set.

What you expected to happen: I believe that Paths used to work and now they dont, which greatly confused me.

Minimal Complete Verifiable Example:

```python (hv) jamesmcc@panama[523]:~> cat enc_source_pathlib.py import numpy as np from pathlib import Path import xarray as xr

inspiration in the test

https://github.com/pydata/xarray/blob/97887fd9bbfb2be58b491155c6bb08498ce294ca/xarray/tests/test_backends.py#L4918

rnddata = np.random.randn(10) ds = xr.Dataset({"foo": ("x", rnddata)}) file_name = "rnddata.nc" ds.to_netcdf(file_name)

with xr.open_dataset(file_name) as ds: assert ds.encoding["source"] == file_name

with xr.open_dataset(Path(file_name)) as ds: print(ds.encoding) assert ds.encoding["source"] == file_name

(hv) jamesmcc@panama[524]:~/> ipython enc_source_pathlib.py /Users/jamesmcc/python_libs/xarray/xarray/backends/cfgrib_.py:28: UserWarning: Failed to load cfgrib - most likely there is a problem accessing the ecCodes library. Try import cfgrib to get the full error message "Failed to load cfgrib - most likely there is a problem accessing the ecCodes library. " /Users/jamesmcc/python_libs/xarray/xarray/backends/plugins.py:61: RuntimeWarning: Engine 'cfgrib' loading failed: Cannot find the ecCodes library warnings.warn(f"Engine {name!r} loading failed:\n{ex}", RuntimeWarning) {'unlimited_dims': set()}

KeyError Traceback (most recent call last) ~/python_libs/xarray/enc_source_pathlib.py in <module> 16 with xr.open_dataset(Path(file_name)) as ds: 17 print(ds.encoding) ---> 18 assert ds.encoding["source"] == file_name 19 20

KeyError: 'source' ```

I scanned git blame, but didnt turn up any obviously undesired changes.