in the process, eliminate the need to explicitly specify the
source/destination type at the callsites.

Change-Id: Ie556645791a479989fb737933f1dd58e8533cb1c
Reviewed-on: https://gerrit.libreoffice.org/39171Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>