which has been there ever since
commit fd069bee7e57ad529c3c0974559fd2d84ec3151a
Date: Mon Sep 18 16:07:07 2000 +0000
initial import
And add assert to prevent more duplicates
Change-Id: I371a117896c1ab36fabf69da41229a7bcf5459d9
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/102366
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
e628b94ccf