Documentation / technical / api-xdiff-interface.txton commit ls-files -k: a directory only can be killed if the index has a non-directory (2eac2a4)
   1xdiff interface API
   2===================
   3
   4Talk about our calling convention to xdiff library, including
   5xdiff_emit_consume_fn.
   6
   7(Dscho, JC)