And that "one data structure" is a directed acyclic graph of objects, where an object is one of four kinds: - blob (like a file) - tree (referencing trees and

And that "one data structure" is a directed acyclic graph of objects, where an object is one of four kinds: - blob (like a file) - tree (referencing trees and/or blobs, like a directory) - commit (referencing one tree and other commits) - tag (referencing a commit)