bind

# File actionpack/lib/action_controller/request.rb, line 808
      def bind(key, value)
        if top.is_a? Array
          if key
            if top[-1].is_a?(Hash) && ! top[-1].key?(key)
              top[-1][key] = value
            else
              top << {key => value}.with_indifferent_access
              push top.last
              value = top[key]
            end
          else
            top << value
          end
        elsif top.is_a? Hash
          key = CGI.unescape(key)
          parent << (@top = {}) if top.key?(key) && parent.is_a?(Array)
          top[key] ||= value
          return top[key]
        else
          raise ArgumentError, "Don't know what to do: top is #{top.inspect}"
        end

        return value
      end