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: module_data_store_with_fallbacks.rb
    path of file: ./repos/metasploit-framework/lib/msf/core
    
    the code of the file until where you have to start completion: # -*- coding: binary -*-
module Msf

  ###
  #
  # DataStore wrapper for modules that will attempt to back values against the
  # framework's datastore if they aren't found in the module's datastore.  This
  # is done to simulate global data store values.
  #
  ###
  class ModuleDataStoreWithFallbacks < DataStoreWithFallbacks

    # @param [Msf::Module] m
    def initialize(m)
      super()
    
    def search_for(key)
      k = find_key_case(key)
      return search_result(:user_defined, @user_defined[k]) if @user_defined.key?(k)

      # Preference globally set values over a module's option default
      framework_datastore_search = search_framework_datastore(key)
      return framework_datastore_search if framework_datastore_search.found? && !framework_datastore_search.default?

      option = @options.fetch(k) { @options.find { |option_name, _option| option_name.casecmp?(k) }&.last }
      if option
        # If the key isn't present - check any additional fallbacks that have been registered with the option.
        # i.e. handling the scenario of SMBUser not being explicitly set, but the option has registered a more
        # generic 'Username' fallback
        option.fallbacks.each do |fallback|
          fallback_search = search_for(fallback)
          if fallback_search.found?
            return search_result(:option_fallback, fallback_search.value, fallback_key: fallback)
          end
        end