How scanRd reads macros: specOf gives the modes of a macro's groups (lowercase required, uppercase optional, e.g. vV; undefined if unknown, the default),
lenient reads an unknown macro with all groups that follow instead of reporting it and dropping its first group, and macros are expanded first.
How scanRd reads macros:
specOfgives the modes of a macro's groups (lowercase required, uppercase optional, e.g.vV;undefinedif unknown, the default),lenientreads an unknown macro with all groups that follow instead of reporting it and dropping its first group, andmacrosare expanded first.