Best practise to deal with incompatible usage of intergerp

It's me FKtPp ;) writes:

 > I find, in nxml code integerp is used to determind if its argument is a
 > single character.

Aidan may have a better idea, but I would guess that's a hangover from
the original code, which was designed for GNU Emacs, and never worked
perfectly in XEmacs.  GNU Emacs still does not have a character type,
only integers and strings.

If you want to know exactly when a line was changed and how, use hg
annotate.