t / t4013 / diff.diff-tree_initial_modeon commit merge-options.txt: clarify meaning of various ff-related options (27fd1e4)
   1$ git diff-tree initial mode
   2:100644 100755 01e79c32a8c99c557f0757da7cb6d65b3414466d 01e79c32a8c99c557f0757da7cb6d65b3414466d M      file0
   3$