issue_comments: 382832952

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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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