issue_comments: 280259483

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https://github.com/pydata/xarray/issues/1271#issuecomment-280259483 https://api.github.com/repos/pydata/xarray/issues/1271 280259483 MDEyOklzc3VlQ29tbWVudDI4MDI1OTQ4Mw== 10050469 2017-02-16T08:00:19Z 2017-02-16T08:00:19Z MEMBER

divide attrs into two kinds, units and metadata

Coordinate reference systems (crs) are an example of attribute which is always valid after selection, arithmetic, or even reduction since they apply to the coordinates of the DataArray. A global option to keep certain attrs (like crs) would be very useful to downstream libraries like salem. 

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