class FDB::DirectoryLayer

def subdir_names_and_nodes(tr, node) 

def subdir_names_and_nodes(tr, node)
  subdir = node[@@SUBDIRS]
  tr.get_range(subdir.range[0], subdir.range[1]).map { |kv|
    [subdir.unpack(kv.key)[0], node_with_prefix(kv.value)]
  }
end