class ActionDispatch::Cookies::SignedCookieJar

def []=(name, options)
  if options.is_a?(Hash)
    options.symbolize_keys!
    options[:value] = @verifier.generate(serialize(name, options[:value]))
  else
    options = { :value => @verifier.generate(serialize(name, options)) }
  end
  raise CookieOverflow if options[:value].bytesize > MAX_COOKIE_SIZE
  @parent_jar[name] = options
end