set \variablefam = -1 as initial value (H.Hagen).

source/texk/web2c/luatexdir/ChangeLog

+2022-11-20  Luigi Scarso <luigi.scarso@gmail.com> 
+    * set \variablefam = -1 as initial value (H.Hagen).
+
 2022-11-20  Luigi Scarso <luigi.scarso@gmail.com> 
     * Ensured that load_hyphenation has enough Lua stack, and pops the latest table pushed in (Michal Vlasák).
 

source/texk/web2c/luatexdir/luatex_svnversion.h

 #ifndef luatex_svn_revision_h
 #define luatex_svn_revision_h
-#define luatex_svn_revision 7549
+#define luatex_svn_revision 7550
 #endif

source/texk/web2c/luatexdir/tex/maincontrol.c

@@ -4333,6 +4333,7 @@ void initialize(void)
         px_dimen_par = one_bp;
         math_eqno_gap_step_par = 1000 ;
         math_flatten_mode_par = 1; /* ord */
+        var_fam_par = -1;
         cs_text(frozen_protection) = maketexstring("inaccessible");
         format_ident = maketexstring(" (INITEX)");
         cs_text(end_write) = maketexstring("endwrite");