@Override public int listSizeInBytes(List<byte[]> values) {
      int sizeInBytes = 5;
      for (byte[] value : values) {
        sizeInBytes += value.length;
      }
      return sizeInBytes;
    }
Encoding overhead is thrift type plus 32-bit length prefix
zipkin/src/main/java/zipkin2/codec/Encoding.java