issue_comments: 248143020

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https://github.com/pydata/xarray/issues/1009#issuecomment-248143020 https://api.github.com/repos/pydata/xarray/issues/1009 248143020 MDEyOklzc3VlQ29tbWVudDI0ODE0MzAyMA== 1217238 2016-09-19T22:10:02Z 2016-09-19T22:10:02Z MEMBER

I think we can keep attributes always for this operations.

The line I tried to draw was: - For operations that rearrange/manipulate existing data, keep attributes - For operations that do computation to produce new data, drop attributes

 
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