git의 모든 객체 oid는 hash 로 표현 Scaling Git's garbage collection | The GitHub BlogAt GitHub, we store a lot of Git data: more than 18.6 petabytes of it, to be precise. That's more than six times the size of the Library of Congress's digital collections. Most of that data comes from the contents of your repositories: your READMEs, source files, tests, licenses, and so on.https://github.blog/2022-09-13-scaling-gits-garbage-collection
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