Is there a function to delete *all* attributes of a graph (graph, vertex,
and edge level)? If not, is the way to do it, e.g.

delete_all_attr <- function(g) {
  for (att in graph_attr_names(g)) g <- delete_graph_attr(g, att)
  for (att in vertex_attr_names(g)) g <- delete_vertex_attr(g, att)
  for (att in edge_attr_names(g)) g <- delete_edge_attr(g, att)
  return(g)
}

Thanks,
Chris
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