Gem::Specification#initialize_copy

# File tmp/rubies/ruby-4.0.0/lib/rubygems/specification.rb, line 1955
def initialize_copy(other_spec)
  self.class.array_attributes.each do |name|
    name = :"@#{name}"
    next unless other_spec.instance_variable_defined? name

    begin
      val = other_spec.instance_variable_get(name)
      if val
        instance_variable_set name, val.dup
      elsif Gem.configuration.really_verbose
        warn "WARNING: #{full_name} has an invalid nil value for #{name}"
      end
    rescue TypeError
      e = Gem::FormatException.new \
        "#{full_name} has an invalid value for #{name}"

      e.file_path = loaded_from
      raise e
    end
  end

  @required_ruby_version = other_spec.required_ruby_version.dup
  @required_rubygems_version = other_spec.required_rubygems_version.dup
end