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
1326509734,PR_kwDOAMm_X848ikDG,6871,Handle None in assert_valid_xy,14371165,closed,0,,,3,2022-08-02T23:37:19Z,2022-08-12T08:59:59Z,2022-08-03T22:08:45Z,MEMBER,,0,pydata/xarray/pulls/6871,"Reduce diffs in #6778. 
* Handle `None` as the error message suggest should be possible 
* Add some typing while at it. 

mypy noticed that Hashable cannot use `"", "".join`-method so forcing them to `str` instead. 
Should be the same problem in #6856 but `Frozen` returns `Any` instead of `Hashable` for some reason.","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/6871/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull