\newluatexattribute\ltj@yablshift % attribute for \yabaselineshift
\newluatexattribute\ltj@ykblshift % attribute for \ykbaselineshift
\newluatexattribute\jfam % index for current jfam
+\newlanguage\ltj@@japanese
\ltj@icflag=0
\ltj@origchar=0
\ltj@charclass=0