Documentation / technical / api-xdiff-interface.txton commit builtin/ls-files: convert overlay_tree_on_cache to object_id (6f37eb7)
   1xdiff interface API
   2===================
   3
   4Talk about our calling convention to xdiff library, including
   5xdiff_emit_consume_fn.
   6
   7(Dscho, JC)