%pip install GitPython==3.1.11Requirement already satisfied: GitPython==3.1.11 in /usr/local/python3.7/lib/python3.7/site-packages (3.1.11)Requirement already satisfied: gitdb<5,>=4.0.1 in /usr/local/python3.7/lib/python3.7/site-packages (from GitPython==3.1.11) (4.0.5)Requirement already satisfied: smmap<4,>=3.0.1 in /usr/local/python3.7/lib/python3.7/site-packages (from gitdb<5,>=4.0.1->GitPython==3.1.11) (3.0.4)%cd $(mktemp -d)  %git init .     Initialized empty Git repository in /tmp/tmp.JXLEk4zfdj/.git/%touch foo %git add foo                  %git update-index --skip-worktree foo%python3 -c '                        import git           with git.Repo(".", search_parent_directories=True) as repo: print(*repo.index.iter_blobs())'Traceback (most recent call last):  File "<string>", line 4, in <module>  File "/usr/local/python3.7/lib/python3.7/site-packages/git/index/base.py", line 441, in iter_blobs    for entry in self.entries.values():  File "/usr/local/python3.7/lib/python3.7/site-packages/gitdb/util.py", line 253, in __getattr__    self._set_cache_(attr)  File "/usr/local/python3.7/lib/python3.7/site-packages/git/index/base.py", line 128, in _set_cache_    self._deserialize(stream)  File "/usr/local/python3.7/lib/python3.7/site-packages/git/index/base.py", line 157, in _deserialize    self.version, self.entries, self._extension_data, _conten_sha = read_cache(stream)  File "/usr/local/python3.7/lib/python3.7/site-packages/git/index/fun.py", line 185, in read_cache    version, num_entries = read_header(stream)  File "/usr/local/python3.7/lib/python3.7/site-packages/git/index/fun.py", line 165, in read_header    assert version in (1, 2)AssertionError