issue_comments: 863945975

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https://github.com/pydata/xarray/issues/5490#issuecomment-863945975 https://api.github.com/repos/pydata/xarray/issues/5490 863945975 MDEyOklzc3VlQ29tbWVudDg2Mzk0NTk3NQ== 6574622 2021-06-18T10:44:38Z 2021-06-18T10:44:38Z CONTRIBUTOR

Are your input files on (exactly) the same grid? If not, combining the files might introduce NaN to fill up missmatching cells. Furthemore, if you are working with NaNs, are you aware of: ```python In [1]: import numpy as np

In [2]: np.nan == np.nan Out[2]: False ``` Which is as it should be per IEEE 754.

When writing out the files to netCDF, do you accidentally convert from 64bit float to 32bit float?

 
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