#I DeclareGlobalFunction: too many arguments in /home/scratch/scratch2/dimpase/sage/sagetrac-mirror/local/var/tmp/sage/build/gap-4.12.1/src/pkg/repndecomp/lib/block_diagonalize.gd:18
#I DeclareGlobalFunction: too many arguments in /home/scratch/scratch2/dimpase/sage/sagetrac-mirror/local/var/tmp/sage/build/gap-4.12.1/src/pkg/repndecomp/lib/block_diagonalize.gd:29
while testing with GAP 4.12.1, I see