Hi,

I uploaded a new lmtx. There is a new low level manual (lowlevel-localboxes) that describes the extended local boxes interface as well as a layer on top. New is that we have classes which makes this (engine) mechanism more useable. It definitely is some low level mechanism but you can for instance use if for high performance efficient maginal notes and line numbering in controlled situations. (There is some room fro optimization in the engien but I deal with that later.)

Hans

On the first run of MkIV (context --luatex) after updating my installation on Win11-x64, I get a complaint just after loading .../base/mkiv/syst-mac-lua :

open source     > level 1, order 11, name 'C:/ConTeXt_LMTX/tex/texmf-context/tex/context/base/mkiv/syst-aux.mkiv'
resolvers       > lua > loading file 'C:/ConTeXt_LMTX/tex/texmf-context/tex/context/base/mkiv/syst-aux.lua' succeeded
resolvers       > lua > loading file 'C:/ConTeXt_LMTX/tex/texmf-context/tex/context/base/mkiv/syst-mac.lua' succeeded
! ^^^^ needs four hex digits.
l.1506     {\unless\ifx##2^
                          ^^^3}%
?

If I let the build proceed, all seems to be well.