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/1875#issuecomment-362104114,https://api.github.com/repos/pydata/xarray/issues/1875,362104114,MDEyOklzc3VlQ29tbWVudDM2MjEwNDExNA==,6815844,2018-01-31T23:19:27Z,2018-01-31T23:19:27Z,MEMBER,"I like the option 1.
I agree that the circular coordinate is used in many physics fields (actually I'm not from geoscience and I also sometimes use the circular coordinate), but one confusing sene I can think of is when using it in radian, (0, 0.5 pi, pi ...).
Manual overwite would be more explicit

Another option could be to add a circular cooredinate class after #1603 is implemented?
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