Go beyond \section when using --shift-heading-level-by=-1

[Fnuxus]

I frequently use this command for converting mediawiki-encoded text:

pandoc input.txt -f mediawiki -t latex -o output.tex

The output is included in a scrbook class book project.

Problem: pandoc converts =heading= to \section, but I need it to be \chapter instead.

If I change the input to this:

pandoc input.txt -f mediawiki -t latex --shift-heading-level-by=-1 -o output.tex

the =heading= encoding loses its encoding altogether.

Expected behaviour: If --shift-heading-level-by=-1 ist used, =heading= should be converted to \chapter, --shift-heading-level-by=-2 should be converted to \part.