There are many issues which I should check and solve. But, I mainly try to implement SPVM project. This improve Perl performance significantly. This is important for Perl future. https://github.com/yuki-kimoto/SPVM Until implementing main part of SPVM , I need 1 - 2 years. Sorry, I can't have the enough time to fix GitPrep now. I'm happy for you to solve the bug of GitPrep if you need to fix it early time.