1 files changed, 15 insertions, 2 deletions
diff --git a/Master/texmf-dist/source/latex-dev/base/ltmath.dtx b/Master/texmf-dist/source/latex-dev/base/ltmath.dtx
index 9f000a41b48..1bd979f7de5 100644
--- a/Master/texmf-dist/source/latex-dev/base/ltmath.dtx
+++ b/Master/texmf-dist/source/latex-dev/base/ltmath.dtx
@@ -38,7 +38,7 @@
 %<*driver>
 % \fi
 \ProvidesFile{ltmath.dtx}
-              [2021/10/14 v1.2j LaTeX Kernel (Math Setup)]
+              [2022/05/08 v1.2l LaTeX Kernel (Math Setup)]
 % \iffalse
 %</driver>
 %
@@ -467,8 +467,9 @@
 % \end{macro}
 %
 % \begin{macro}{\openup}
+% \changes{v1.2k}{2022/04/08}{Make \cs{protected} (gh/123)}
 %    \begin{macrocode}
-\def\openup{\afterassignment\@penup\dimen@}
+\protected\def\openup{\afterassignment\@penup\dimen@}
 %    \end{macrocode}
 %
 %    \begin{macrocode}
@@ -1089,6 +1090,18 @@
 %    \end{macrocode}
 % \end{macro}
 %
+% \changes{v1.2l}{2022/05/08}{Use consistent math styles under \LuaTeX}
+% \LuaTeX\ contains new math primitives to place expression over or under
+% horizontally extensible glyphs. Before \LuaTeX\ 1.14 these did not work
+% correctly with the |\mathstyle| primitive and sometimes did not use
+% cramped style in consistent ways. For newer version, we opt into the
+% corrected behavior.
+%    \begin{macrocode}
+\ifx\mathdefaultsmode\@undefined\else
+  \mathdefaultsmode=1
+\fi
+%    \end{macrocode}
+%
 %    \begin{macrocode}
 %</2ekernel>
 %    \end{macrocode}