-\newluatexattribute\jfam % index for current jfam
-\newluatexattribute\ltj@uniqid % unique id of box/paragraph
-\newluatexattribute\ltj@charclass %
-\newluatexattribute\ltj@origchar %
-\newluatexattribute\ltj@yablshift % attribute for \yabaselineshift
-\newluatexattribute\ltj@ykblshift % attribute for \ykbaselineshift