html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/7191#issuecomment-1287124949,https://api.github.com/repos/pydata/xarray/issues/7191,1287124949,IC_kwDOAMm_X85Mt_fV,2448579,2022-10-21T15:30:10Z,2022-10-21T15:30:35Z,MEMBER,"> I'm also not sure why _FillValue and missing_value should be required to have the same value.

Xarray has only one way to represent both concepts: `np.nan`. So when you decode you lose information on whether a value was a `missing_value` or `_FillValue`. Then when you encode, you have to pick either `_FillValue` or `missing_value` to represent the `np.nan`

>  to_netcdf will assign '_FillValue': nan. 

This seems like a bug. Can you open a new issue with a minimum reproducible example that uses random data please?

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