pygit2

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submodule.head_id returns garbage results when the submodule is not yet committed:

> git init
> git submodule add https://github.com/pytest-dev/pytest     
> git -C pytest checkout 34a285986e456406b22b62aa563a64331f640e7f                                          
> python script.py  # see below
Submodule head id: 801cb63aa57f0000602d0c3da57f000006000000
Submodule head id: e400000000000000000000000000000077726974

Note that the result of head_id is not even stable.

script.py is

from pygit2 import Repository

repo = Repository('.')
sub_module = repo.lookup_submodule('pytest')

print("Submodule head id:", sub_module.head_id)
print("Submodule head id:", sub_module.head_id)

Python version: 3.8.10 Pygit2 version: 1.9.2