bug#27584: 26.0.50; alist-get: Add optional arg TESTFN

[Tino Calancha]

Nicolas Petton <nicolas@petton.fr> writes:

> Tino Calancha <tino.calancha@gmail.com> writes:
>
>
>> 1. In my patch `assoc-predicate' is a defsubst.
>>    Should does exit at all?
>
> I would inline its call and use `assoc-default' directly, but I guess
> it's a matter of taste.
Following Stefan suggestion, we can optimize using a compiler macro.
Then, `assoc-default' is just the default case.
>
> But wouldn't it be better if `assoc' took an optional testfn?  I'm not
> sure I like the `full' parameter in `assoc-default', and I think the
> inconsistency of the return values between `assoc' and `assoc-default'
> is already confusing.
In fact, that would kill 2 birds in a shot.