Tracking parent branches in Git

Hello,

We would like to track parent branches so that creating pull requests can automatically determine the correct branch to merge against.  I understand that this would require tracking more information than is currently available right now in git.  Also, it seems that if some cases, it is not possible to determine a parent branch, in which case it would just be empty/null.  If I made a change to track the parent branch for each branch, would this feature be accepted/welcomed as part of git, even if it off by default?

Thanks,
Eric

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