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
700915153,MDU6SXNzdWU3MDA5MTUxNTM=,4421,circular + linear stats on a same dataset,18679148,open,0,,,1,2020-09-14T09:03:24Z,2020-11-01T13:44:26Z,,NONE,,,,"<!-- Please do a quick search of existing issues to make sure that this has not been asked before. -->

**Is your feature request related to a problem? Please describe.**
I would like to calculate the mean on all variables of my dataset which is easy and straightforward with xarray, for example:
`ds.mean(dim='time)`
The issue is I have some circular quantities in this dataset (for example wind direction). I can use script.stats.circmean/std, but I have to discriminate myself when I have to use one or the other function.

**Describe the solution you'd like**
I would like to add a parameter in the description of my variable mentioning it is circular. Every time I apply a function on the full dataset, it uses the circular equivalent if it exists.

There is perhaps some tricks to do it, but I didn't find any so far. Thank you.
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