t / t4013 / diff.diff_--no-index_--raw_--abbrev=4_dir2_diron commit t/perf: add fallback for pre-bin-wrappers versions of git (28e1fb5)
   1$ git diff --no-index --raw --abbrev=4 dir2 dir
   2:000000 100644 0000... 0000... A        dir/sub
   3$