git add -p—splitting hunks, limit is too large

Hi git developers and community,

I'd like to inquire as to why `git add -p` can only split hunks so
much. The limit is too large; why can't you split until each hunk is
only a line? I often have to run `edit` and split them manually
myself.

I'd like to contribute a patch to change it, although my C is rusty.
Are there resources that will help me to do this?

Thank you for your time.

Beau