Test for equality of schema key sets, not for zero symmetric difference.
Test for equality of schema key sets, not for zero symmetric difference.

perrygeo/Fiona,rbuffat/Fiona,sgillies/Fiona,rbuffat/Fiona,Toblerity/Fiona,Toblerity/Fiona,perrygeo/Fiona,johanvdw/Fiona