Documentation / technical / api-xdiff-interface.txton commit get_packed_ref_cache(): take a `packed_ref_store *` parameter (8e821c3)
   1xdiff interface API
   2===================
   3
   4Talk about our calling convention to xdiff library, including
   5xdiff_emit_consume_fn.
   6
   7(Dscho, JC)