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/pull/2016#issuecomment-382832952,https://api.github.com/repos/pydata/xarray/issues/2016,382832952,MDEyOklzc3VlQ29tbWVudDM4MjgzMjk1Mg==,43698,2018-04-19T18:19:03Z,2018-04-19T18:19:03Z,NONE,"It seems that this PR exposed a new encoding key 'missing_value', and this makes the encoding fail to round-trip, as it is not explicitly allowed in `xarray.backends.netCDF4_._extract_nc4_variable_encoding` function (similar to #1869).
This leads to the following error when saving with an explicitly preserved encoding: 
ValueError: unexpected encoding parameters for 'netCDF4' backend:  ['missing_value']
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