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/pull/2650#issuecomment-454164295,https://api.github.com/repos/pydata/xarray/issues/2650,454164295,MDEyOklzc3VlQ29tbWVudDQ1NDE2NDI5NQ==,6815844,2019-01-14T21:16:08Z,2019-01-14T21:16:08Z,MEMBER,"@max-sixty 

> The error is when applying over a dimension on a dataset where only some of the variables have the dimension; 

I remember I faced the same issue in implementing `differentiate`, `interp`, `trapz`, etc... and manually wrote the same logic for several times.

> If it's helpful to add that functionality directly to apply_ufunc, lmk.

I think it would make the code much cleaner at least for these methods.","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,396084551
https://github.com/pydata/xarray/pull/2650#issuecomment-452183122,https://api.github.com/repos/pydata/xarray/issues/2650,452183122,MDEyOklzc3VlQ29tbWVudDQ1MjE4MzEyMg==,6815844,2019-01-08T05:46:50Z,2019-01-08T05:46:50Z,MEMBER,"I like `window_type` / `weighting` argument to `Rolling`.
But a little concern is whether it matches to the current API, such as `__iter__`.

BTW, does `ewm` computes the window mean based on index or coordinate value?","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,396084551