Ævar Arnfjörð Bjarmason [off-list ref] writes:

On Sun, Jan 03 2021, brian m. carlson wrote:

We just have to worry about cases where you're not all of these people
in one project's commit metadata and/or .mailmap, and thus mailmap rules
would match too generously:

    "brian m. carlson" [off-list ref]
    "brian m. carlson" [off-list ref]
    "BRIAN M. CARLSON" [off-list ref]
    "BRIAN M. CARLSON" [off-list ref]

Is that really plausible? In any case, neither of these two patches make
reference to us already having changed this in the past in 1.6.2 and &
there being reports on the ML about the bug & us changing it back. See
https://lore.kernel.org/git/f182fb1700e8dea15459fd02ced2a6e5797bec99.1238458535u.git.johannes.schindelin@gmx.de/ (local)

Maybe we should still do this, but I think for a v3 it makes sense to
summarize that discussion etc.

After reading the old discussion again, I am not sure if this is
worth doing.  To many people, it is a promise we've made and kept
that we treat addresses including the local part case-insensitively
when summarising commits by ident strings.

I'd really wish that this series were structured to have 5/5 early
and 3&4/5 squashed into a single final patch.