Sequential commit numbers? How does that work with branching? Or other people's commits? eg. I commit #100, you commit #100, you pull my commit, now we have dup

Sequential commit numbers? How does that work with branching? Or other people's commits? eg. I commit #100, you commit #100, you pull my commit, now we have duplicate identifiers. Git commit ids are a hash of the commit content. This has very nice properties in that: - Ids are duplicate if and only if the commit is identical (the collision chance is so low it's not worth considering) - It's content-addressable And you can refer to it by any unique prefix, so it's not a pain to type out (and you should only rarely be typing out particular commits instead of branches or tags).