issue_comments: 501075199

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https://github.com/pydata/xarray/pull/3013#issuecomment-501075199 https://api.github.com/repos/pydata/xarray/issues/3013 501075199 MDEyOklzc3VlQ29tbWVudDUwMTA3NTE5OQ== 191850 2019-06-12T00:37:24Z 2019-06-12T00:37:24Z CONTRIBUTOR

thank you @dcherian!

I added offsets, units, descriptions attributes. The other attributes (res, nodata, crs, transform, bounds and res) were already available.

mask_flag_enums is a list of tuples, I have tried to add this attribute too but the TestRasterio::test_serialization fails with the message:

```python

??? E ValueError: multi-dimensional array attributes not supported

netCDF4/_netCDF4.pyx:1529: ValueError ```

@fmaussion any feedback is welcome!

 
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