Re: LuaTeX >= 0.85 support

[Karl Berry]

    However, LuaTeX team changed them significantly after ver. 0.80.

Yes.  And more changes will surely come, at any and every level -- no
stability has ever been guaranteed until 1.0, for which there is no ETA.

E.g., the latest news is that (as I understand it) LuaTeX ignores
\language0 and thus does not hyphenate normal English by default.  I
don't know how to restore the standard behavior.
  http://tug.org/pipermail/luatex/2016-February/005685.html

Hans told me there is a file luatex-pdf.tex in the ConTeXt distribution
that shows the changes.  I can also send you guys preprints of a couple
of short articles by him for the next TUGboat describing (some of) the
changes, if you want.

If it were up to me, I would simply declare LuaTeX unsupported at least
until 1.0.  It seems that tracking Hans's changes from now on will imply
a huge investment of time and effort, let alone doing it in a compatible
way so that people not running the bleeding edge will keep working as
well.  I don't see that the return is worth it.  But of course, if you
want to, more power to you!

Best,
Karl