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/2612#issuecomment-449158415,https://api.github.com/repos/pydata/xarray/issues/2612,449158415,MDEyOklzc3VlQ29tbWVudDQ0OTE1ODQxNQ==,6815844,2018-12-20T22:38:19Z,2018-12-20T22:39:20Z,MEMBER,"During writing the test codes, I realized that the default `boundary='exact'` is a little annoying.
It would be rare that the length of the data is exactly a multiple of the window size; we almost always need to type `bounary='trim'` or the other.
I personally think that `boundary='pad'` is also a good default, as it is a similar behaviour to `rolling`.

The down side of this is that it can make a uniformly spaced data an inhomogeneously spaced one.
It is something what users may not expect.
(probably `boundary='exact` is safer)","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,391477755
https://github.com/pydata/xarray/pull/2612#issuecomment-449142367,https://api.github.com/repos/pydata/xarray/issues/2612,449142367,MDEyOklzc3VlQ29tbWVudDQ0OTE0MjM2Nw==,6815844,2018-12-20T21:33:22Z,2018-12-20T21:33:22Z,MEMBER,"Updated.
The main change is
1. API updated to
```python
dataset.coarsen(self, dim=None, boundary='exact', side='left',
                            coordinate_func='mean', **dim_kwargs):
```
based on comments.

2. nanmean for DateTime was implemented.
This is a kind of backward incompatible.
Previously, we raised an Error if mean is applied to a datetime array.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,391477755
https://github.com/pydata/xarray/pull/2612#issuecomment-447736226,https://api.github.com/repos/pydata/xarray/issues/2612,447736226,MDEyOklzc3VlQ29tbWVudDQ0NzczNjIyNg==,6815844,2018-12-17T06:27:35Z,2018-12-17T06:27:35Z,MEMBER,"@dcherian 
Thanks.
> (da.time - da.time[0]).mean() + da.time[0]
I would add mean for datetime-arrays.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,391477755