issue_comments: 493453581

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https://github.com/pydata/xarray/pull/2968#issuecomment-493453581 https://api.github.com/repos/pydata/xarray/issues/2968 493453581 MDEyOklzc3VlQ29tbWVudDQ5MzQ1MzU4MQ== 10194086 2019-05-17T13:28:29Z 2019-05-17T13:28:29Z MEMBER

I think you can keep the function signature of reduce but rather allow to set min_periods=0 in __init__ (This is currently disallowed on Line 77).

Then you change your code in reduce to ``` python if self.min_periods == 0: return result

```

btw: If I understand correctly, this does not need to be added for the other functions ds.rolling(...).mean() calls reduce on Line 238.

 
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