The second file is just not stored, because git thinks it's already there. Nothing complicated there. Discussed here: https://stackoverflow.com/questions/93923

The second file is just not stored, because git thinks it's already there. Nothing complicated there. Discussed here: https://stackoverflow.com/questions/9392365/how-would-git-handle-a-sha-1-collision-on-a-blob https://stackoverflow.com/questions/9392365/how-would-git-ha... It costed 6500 CPU years to create the first collision containing a valid pdf document. Storing both versions into git still works, because git prepends a header before creating the SHA-1 of the blob. I believe because of that it is harder to create a git blob collision than a pdf collision. (I admit I did neither read very carefully nor try to think it through very seriously.)