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/issues/3266#issuecomment-704290169,https://api.github.com/repos/pydata/xarray/issues/3266,704290169,MDEyOklzc3VlQ29tbWVudDcwNDI5MDE2OQ==,10194086,2020-10-06T14:01:57Z,2020-10-07T09:32:37Z,MEMBER,"Currently most warnings (> 1500 of 1900) stem from netCDF4. They should be fixed in the newest netCDF4 version (1.5.4). See https://github.com/Unidata/netcdf4-python/blob/master/Changelog (`alen` -> `len` and `tostring` -> `tobytes`). However, netCDF 1.5.4 can not be installed alongside pynio (conda-forge/pynio-feedstock#90).

Addendum: Removing pynio from the tests and thus using the newest version of netCDF4 brings the warnings down to 71 (from 1931), see  #4492



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