pub fn parse_numstat_z(bytes: &[u8]) -> Numstat
git diff [--cached] --numstat -z: added\tdeleted\tpath\0, renames as added\tdeleted\t\0src\0dst\0.
git diff [--cached] --numstat -z
added\tdeleted\tpath\0
added\tdeleted\t\0src\0dst\0