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/921#issuecomment-237250366,https://api.github.com/repos/pydata/xarray/issues/921,237250366,MDEyOklzc3VlQ29tbWVudDIzNzI1MDM2Ng==,2443309,2016-08-03T14:20:02Z,2016-08-03T14:20:02Z,MEMBER,"It seems to me that `xarray` has the same convention for `dims` that `netCDF4` has for `dimensions`, `OrderedDict` for the dataset, `tuple` for the variables (`DataArray`s).

I do see the utility in switching to an `OrderedDict` for both. I have had times where I need to know the size of a dimension on a data array and as @shoyer mentioned, its a bit of a hunt at the moment. That would be my vote if we're willing to make that breaking change.  
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