You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: max_bson_size.rb
    path of file: ./repos/mongo-ruby-driver/lib/mongo/error
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
# rubocop:todo all

# Copyright (C) 2014-2020 MongoDB Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except i
    
      def initialize(max_size_or_msg = nil)
        if max_size_or_msg.is_a?(Numeric)
          msg = "#{MESSAGE}. The maximum allowed size is #{max_size_or_msg}"
        elsif max_size_or_msg
          msg = max_size_or_msg
        else
          msg = MESSAGE
        end