issue_comments: 759397199

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https://github.com/pydata/xarray/issues/4798#issuecomment-759397199 https://api.github.com/repos/pydata/xarray/issues/4798 759397199 MDEyOklzc3VlQ29tbWVudDc1OTM5NzE5OQ== 7226087 2021-01-13T11:47:39Z 2021-01-13T11:47:39Z NONE

Actually, this is a problem which is specific to the netcdf4 backend, using h5netcdf, this works: ```python import xarray as xr

ds = xr.Dataset(attrs={"foo": ["bar"]},)

ds.to_netcdf("ds.nc", engine="h5netcdf") rd = xr.open_dataset("ds.nc", engine="h5netcdf")

assert ds.attrs["foo"] == rd.attrs["foo"] ``` and runs without problems.

As soon as I involve netcdf4 in reading or writing, this fails.

I don't know enough about netcdf's on-disk format to really debug what is going on. The ncdump output looks identical to me for both engines.

 
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