# File lib/openid/extensions/pape.rb, line 116
      def parse_extension_args(args, strict=false)
        policies_str = args['auth_policies']
        if policies_str
          @auth_policies = policies_str.split(' ')
        end

        nist_level_str = args['nist_auth_level']
        if nist_level_str
          # special handling of zero to handle to_i behavior
          if nist_level_str.strip == '0'
            nist_level = 0
          else
            nist_level = nist_level_str.to_i
            # if it's zero here we have a bad value
            if nist_level == 0
              nist_level = nil
            end
          end
          if nist_level and nist_level >= 0 and nist_level < 5
            @nist_auth_level = nist_level
          elsif strict
            raise ArgumentError, "nist_auth_level must be an integer 0 through 4, not #{nist_level_str.inspect}"
          end
        end

        auth_age_str = args['auth_age']
        if auth_age_str
          # special handling of zero to handle to_i behavior
          if auth_age_str.strip == '0'
            auth_age = 0
          else
            auth_age = auth_age_str.to_i
            # if it's zero here we have a bad value
            if auth_age == 0
              auth_age = nil
            end
          end
          if auth_age and auth_age >= 0
            @auth_age = auth_age
          elsif strict
            raise ArgumentError, "auth_age must be a non-negative integer, not #{auth_age_str.inspect}"
          end
        end
      end