Got it - thanks for clarifying!

-Sora

On Mon, Feb 19, 2024 at 9:30 PM Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Sora Takai <booksipadtest@gmail.com>
> > Date: Mon, 19 Feb 2024 11:10:42 +0900
> >
> > 1. Are negative 'priority integers interpreted in an intuitive sense?
> That is, would overlays with negative
> > 'priority numbers rank distinctly lower than anything with higher
> 'priority values (0 or above)?
> >
> > 2. Are they "valid" in a sense that emacs intends 'priority property to
> be (in which case the manual description
> > would have to be changed).
>
> Negative priority values are valid, but used internally by Emacs.  So
> we don't recommend using them in Lisp programs, as doing so might get
> in the way of some Emacs features.
>
> > Personally, I think having negative 'priority -- given it works as
> intended -- is useful, since I sometimes bump
> > into use cases where I'd like to make sure certain overlays have the
> lowest 'priority possible below all others.
>
> We recommend you not to use these values.
>