issue_comments: 226179313

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https://github.com/pydata/xarray/issues/742#issuecomment-226179313 https://api.github.com/repos/pydata/xarray/issues/742 226179313 MDEyOklzc3VlQ29tbWVudDIyNjE3OTMxMw== 8982598 2016-06-15T12:59:08Z 2016-06-15T12:59:08Z CONTRIBUTOR

Just a comment that the appearance of object types is likely due to the fact that numpy's NaNs are inherently 'floats' - so this will be an issue for any method with an intermediate `missing data' stage if non-floats are being used.

I still use use the align and fillna method since I mostly deal with floats/complex numbers, although @shoyer 's suggestion of a partial align and then concat could definitely be cleaner when the added coordinates are all 'new'.

 
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