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/6226#issuecomment-1026641184,https://api.github.com/repos/pydata/xarray/issues/6226,1026641184,IC_kwDOAMm_X849MU0g,10194086,2022-02-01T09:34:48Z,2022-02-01T09:34:48Z,MEMBER,"Smaller repro

```python
import xarray as xr
import pickle
t = xr.cftime_range(""20010101"", ""20010520"")
pickle.loads(pickle.dumps(t))
```
Looks like pandas now passes `dtype` on to `__new__` which `CFTimeIndex.__new__` does not accept:

https://github.com/pydata/xarray/blob/fe491b14b113c185b5b9a18e4f643e5a73208629/xarray/coding/cftimeindex.py#L313

Might be pandas-dev/pandas#43188. So `CFTimeIndex.__new__` might need to accept `dtype`? @spencerkclark 
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