issue_comments: 378904185

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https://github.com/pydata/xarray/issues/1625#issuecomment-378904185 https://api.github.com/repos/pydata/xarray/issues/1625 378904185 MDEyOklzc3VlQ29tbWVudDM3ODkwNDE4NQ== 6213168 2018-04-05T11:26:23Z 2018-04-05T11:26:23Z MEMBER

Updated title. I'm happy with the explicit approach. New design prototype: ``` wallet, restaurant_bill = xarray.align(wallet, restaurant_bill, join='outer', fill_value=0) print(wallet - restaurant_bill)

<xarray.DataArray (currency: 2)> array([50, 40]) Coordinates: * currency (currency) object 'EUR' 'USD' ```

 
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