Re: What's missing in ELisp that makes people want to use cl-lib?

[Dmitry Gutov]

On 15/11/2023 21:56, Gerd Möllmann wrote:
> In the case that there is only 1 method, Emacs seems to arrange for that
> method function to be used as function definition of the generic
> function (I'm a bit simplifying here). So it avoids both using a
> discrimating functions, and an effective method function.

That makes a lot of sense indeed: since the function slot can be 
modified directly (and wouldn't break any inline caches, for example), 
why not do that when there's only one definition.

The only downside is that the performance characteristics of callers can 
change unexpectedly as more definitions arrive (which the authors of the 
caller code might not have tested for).