Junio C Hamano <gits...@pobox.com> writes:

> Jeff King <p...@peff.net> writes:
>> OK. I didn't think too hard about it, so I'll trust you that it is not
>> easy. I wonder if using the generation number would be another way of
>> defining "oldest" that would be easier to calculate.
> Go back to my illustration to Greg and think about the implication
> of "TONS!" side branch in the picture has on the generation numbers.

That is, we want some number (I called it "weight") that grows when
"TONS!" side branch is heavy.  Generation numbers are about giving
larger numbers for _longer_ chains, but a long and thin side branch
does not contribute as much as a medium length but a very fat side
branch when merged.

So generation numbers might be a candidate for approximation, but I
do not think it will give us a _good_ approximation.
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