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: option_group.rb
    path of file: ./repos/arachni/lib/arachni
    
    the code of the file until where you have to start completion: =begin
    Copyright 2010-2022 Ecsypno <http://www.ecsypno.com>

    This file is part of the Arachni Framework project and is subject to
    redistribution and commercial restrictions. P
    
        def set_defaults( default_values )
            defaults.merge! default_values

            # Set the specified default values as overrides to the attribute
            # readers.
            defaults.each do |ivar, value|
                define_method "#{ivar}=" do |v|
                    instance_variable_set( "@#{ivar}".to_sym, v.nil? ? value : v)
                end
            end

            defaults
        end