In my production case, I have more than 144k References in the Git directory. (and `packed-refs` file has over 12 MiB) I need to iterate all branches and tags and get their hexsha. However, It takes more than 2500 seconds in iteration. ``` for ref in repo.refs: yield ref.commit.hexsha ``` I think this takes too much time, and I wonder If I need to implement my own `Reference.list_item` method to speed it up? best wishes.