2478             b.put_varint(len as u64)?;  in send()
4266         b.put_varint(ty)?;  in encode_param()
4267         b.put_varint(len as u64)?;  in encode_param()
4290             b.put_varint(tp.max_idle_timeout)?;  in encode()
4306             b.put_varint(tp.max_udp_payload_size)?;  in encode()
4315             b.put_varint(tp.initial_max_data)?;  in encode()
4324             b.put_varint(tp.initial_max_stream_data_bidi_local)?;  in encode()
4333             b.put_varint(tp.initial_max_stream_data_bidi_remote)?;  in encode()
4342             b.put_varint(tp.initial_max_stream_data_uni)?;  in encode()
4351             b.put_varint(tp.initial_max_streams_bidi)?;  in encode()
4360             b.put_varint(tp.initial_max_streams_uni)?;  in encode()
4369             b.put_varint(tp.ack_delay_exponent)?;  in encode()
4378             b.put_varint(tp.max_ack_delay)?;  in encode()
4393             b.put_varint(tp.active_conn_id_limit)?;  in encode()
4414             b.put_varint(max_datagram_frame_size)?;  in encode()
4691             b.put_varint(len as u64)?;  in encode_pkt()
6132         b.put_varint(len as u64).unwrap();  in invalid_initial_payload()