OK, If you really want to know how git works, this is the episode for you. KG talks with his longtime colleague and mentor Gordon McCreight. Gordon is a wiz in general but his knowledge of git goes deep. So in this episode, KG goes solo and really dives in-depth about how git works.
Buckle up and listen on; you'll come out on the outer side with a much sounder understanding of git.
Objects which are no longer referenced can be evicted with git prune; though this is a low-level operation which is often called from git gc. By default it will not remove commits newer than 2 weeks old, and of course the commits that are reachable from that; so provided the branch (or tag) deleted has recent commits, it will stay around in the git repository for up two a fortnight afterwards.
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