fully enclose "\isadigit{...}"; \<^foo> produces "\isactrlfoo ";
fully enclose "\isadigit{...}";
\<^foo> produces "\isactrlfoo ";

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle