https://lists.osgeo.org/pipermail/gdal-dev/2007-November/014795.html
https://lists.osgeo.org/pipermail/gdal-dev/2007-November/014795.html
https://lists.osgeo.org/pipermail/gdal-dev/2007-November/014795.html
https://lists.osgeo.org/pipermail/gdal-dev/2007-November/014795.html
Also keeps references to all base datasets to prevent the wrong GC ordering