Greetings,
I suspect we are targeting Stretch ASAP.
I noticed there was reference to stretch the other week on the kohadevbox, and hacked together something that got a clean ‘vagrant destroy stretch’ then ‘vagrant up stretch’.
I even was crazy enough to attempt a vanilla 32-bit Debian Stretch package install of Koha 17.05 and it seemed to work.
But I suppose that is tangential to your RDF::Trine conversation, which I am clueless about, because I haven’t been tracking that development stuff.