Is Fiona just a neat and nimble (and Pythonic) wrapper for GDAL, or does it contain non GDAL-functionality?

Mads Skjern

Your documentation says (

Fiona contains extension modules that link the Geospatial Data Abstraction Library (GDAL)

Does that mean that all the heavy and mathy calculations are  done in the referenced GDAL library, and Fiona is only a more Pythonic wrapper?
Does it mean that some of the calculations are implemented as part of Fiona, but some functionalities rely entirely on calling GDAL? 

Does it mean that the most essential functionalities are implemented in Fiona, but if needed it does contain a number of extensions that one can choose to use, and these extensions call GDAL?
Does it have other extension modules that rely on other things than GDAL?

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