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It doesn't. It packs it.

• globular-toast 6y ago
  Is git gc the only thing that can trigger packing?
  • auscompgeek 6y ago
    Answered above: https://news.ycombinator.com/item?id=25540122 https://news.ycombinator.com/item?id=25540122
  • glandium 6y ago
    There is also git pack-objects and git repack.