an experiment to see how useful a strong_int template works out

Change-Id: Ib77700350f0fa3b018a1926233adf7a40d728d16
Reviewed-on: https://gerrit.libreoffice.org/34072Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>