docs: public static <T> int writeListTo(OutputStream out, List<T> messages, Schema<T> schema,
              LinkedBuffer buffer) throws IOException
      {
          if (buffer.start != buffer.offset)
              throw new IllegalArgumentException("Buffer previously used and had not been reset.");
  
          final ProtobufOutput output = new ProtobufOutput(buffer);
          int totalSize = 0;
          for (T m : messages)
          {
              schema.writeTo(output, m);
              final int size = output.getSize();
              ProtobufOutput.writeRawVarInt32Bytes(out, size);
              final int msgSize = LinkedBuffer.writeTo(out, buffer);
  
              assert size == msgSize;
  
              totalSize += size;
              output.clear();
          }
          return totalSize;
      }