You're apparently reading things into what I wrote that I didn't say. I didn't say `Linus invented all this stuff'. I said that he got the representation right, not that nobody else had ever done the same. I'm not such a fool as to imagine that nobody else ever tried content-addressable storage in version control systems before. (However, I'm fairly sure nobody ever released a VCS in such an embryonic state before: generally release schedules for VCSes are quite conservative because people hate losing their work. It's impressive that git has managed to go so long with an aggressive release policy with so few incidents of significant data loss.)
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