Re: [PATCH v3 0/4] Standardize early option scanning

> > Changes since v2
> ================
> > Thanks a lot to Junio and Kaartic who reviewed previous versions.
> > Rebased on top of a018953688 (Git 2.56, 2026-09-27) to start from a
> stable base.
> > There are a number of important changes since v2:
> >   - In patch 1/4, parse_options_takes_argument() now considers
>     PARSE_OPT_LASTARG_DEFAULT options as taking a value. This allows us
>     to remove a limitation that was in v2 as these options now consume
>     the next argument when there is one, like in parse_options().
> >   - Patch 2/4 is new, see above.
> >   - In patch 3/4, we reuse the new lookup_long_opt() function extracted
>     by patch 2/4. This removes a number of limitations (around negated
>     forms, unambiguous abbreviations and aliases) that were in v2, as
>     the early scan now behaves in a similar way as parse_options()
>     regarding long options. A number of tests have been added to ensure
>     that.
> >   - In patch 3/4, the scan now stops at short options, unknown options,
>     ambiguous or disallowed abbreviations, options with a low-level
>     callback, and value-taking options given as the last argument,
>     instead of skipping over them, as it could otherwise take an
>     option's value for an option.
> >   - In patch 3/4, early_scan_fn() has a new `unset` argument for
>     negated options, and early_scan_options() now returns the index of
>     the first argument not consumed also when the callback stops the
>     scan.
> >   - In patch 4/4, the commit message and documentation are updated to
>     account for the better behavior of the early scan. A related
>     NEEDSWORK comment is also removed, and some tests added.
>