message: Unnecessary ref
diff: @@ -224,7 +224,7 @@ impl Frame {
  d.encode_varint(*ack_delay);
  d.encode_varint(ack_ranges.len() as u64);
  d.encode_varint(*first_ack_range);
  - for ref r in ack_ranges {
  + for r in ack_ranges {
  d.encode_varint(r.gap);
  d.encode_varint(r.range);
  }
  