bug#81569: 31.0.90; easy-mmode.el: Zero seems inadvertently removed or omitted from documentation

Stefan Monnier <[email protected]> writes:

x>>> Who uses zero, anyway, and why?
>> Regarding this question: There are many cases in the Emacs source code
>> itself where 0 is used to disable a mode, such as for example:
>
> I think we should fix those because I don't think we should encourage
> this use.

One additional point: When calling the functions interactively, then
zero is also used to disable the mode, this is also well documented in
easy-mmode.el at various places, like here:

    If the prefix argument is positive, enable the mode,
    and if it is zero or negative, disable the mode.

and here:

    A prefix argument enables the mode if the argument is positive, and
    disables it otherwise.

Since prefix argument 0 is easier to type than -1, please consider
retaining at least the interactive use of 0.

> But such C-style practice would then suggest

0 to disable something seems not specific to C in any way. For example,
I also set volume to 0 to disable audio. In analogy I would expect
argument 0 to disable a mode, like in interactive use.

Thank you and all the best,
Markus