Re: What does the coding system nil mean?

[Eli Zaretskii]

> Newsgroups: gnu.emacs.help
> From: Jesper Harder <harder@myrealbox.com>
> Date: Sun, 25 Jan 2004 22:09:15 +0100
> 
> Then nil isn't really a coding system, but just a value that some
> coding system related functions happen to interpret in a certain way.

It's a coding system in the sense that every primitive that accepts a
coding system symbol also accepts nil.

> Though, I think it's a bit odd for a predicate called
> `coding-system-p' to return t for an object that is _not_ in fact a
> coding system.

IMHO, it's no more odd than this:

   M-: (listp nil) RET => t