_normalize_callback_option

# File actionpack/lib/abstract_controller/callbacks.rb, line 71
      def _normalize_callback_option(options, from, to) # :nodoc:
        if from = options[from]
          _from = Array(from).map(&:to_s).to_set
          from = proc { |c| _from.include? c.action_name }
          options[to] = Array(options[to]).unshift(from)
        end
      end