message: perf(es/minifier): Optimize usage of `IndexSet`
diff: @@ -111,7 +111,7 @@ struct Data {
  impl Data {
  fn node(&mut self, id: &Id) -> usize {
  - self.graph_ix.get_full(id).map(|v| v.0).unwrap_or_else(|| {
  + self.graph_ix.get_index_of(id).unwrap_or_else(|| {
  let ix = self.graph_ix.len();
  self.graph_ix.insert_full(id.clone());
  ix
  