issue_comments: 440002135

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https://github.com/pydata/xarray/issues/2550#issuecomment-440002135 https://api.github.com/repos/pydata/xarray/issues/2550 440002135 MDEyOklzc3VlQ29tbWVudDQ0MDAwMjEzNQ== 4806877 2018-11-19T18:53:27Z 2018-11-19T18:53:27Z CONTRIBUTOR

Having started writing a test, I now think that encoding['source'] is backend specific. Here it is implemented in netcdf4: https://github.com/pydata/xarray/blob/70e9eb8fc834e4aeff42c221c04c9713eb465b8a/xarray/backends/netCDF4_.py#L386 but I don't see it for pynio for instance: https://github.com/pydata/xarray/blob/70e9eb8fc834e4aeff42c221c04c9713eb465b8a/xarray/backends/pynio_.py#L77-L81

Is this something that we want to mandate that backends provide? 

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