assertData("827f") // 'f' == 16-byte follow-up length.
    assertData(format("%016X", payload.size))
    assertData(payload.readByteString())
  }

  @Test fun clientBinary() {
    val payload =
      (
        "60b420bb3851d9d47acb933dbe70399bf6c92da33af01d4fb770e98c0325f41d3ebaf8986da71" +
          "2c82bcd4d554bf0b54023c2"
      ).decodeHex()