class ActiveSupport::OrderedOptions

def method_missing(name, *args)
  name_string = name.to_s
  if name_string.chomp!('=')
    self[name_string] = args.first
  else
    bangs = name_string.chomp!('!')
    if bangs
      fetch(name_string.to_sym).presence || raise(KeyError.new("#{name_string} is blank."))
    else
      self[name_string]
    end
  end
end