docs(rate_limit): note why the hash tag keeps the rule name

        Result::Evaluation.new(rule: rule, exceeded: count > resolved_limit, info: info)

      end

      # The limiter, rule and characteristics sit inside a Redis hash tag, so a

      # counter and its ban always hash to the same cluster slot. BAN_SCRIPT

      # touches both in one call, and Redis Cluster rejects a script whose keys

      # span slots. +suffix+ is appended outside the tag, so it cannot change

      # the slot and cannot collide with a characteristic value.

      # The braces are the cluster hash tag: a counter and its ban must share a

      # slot because BAN_SCRIPT touches both in one call. The rule name stays

      # inside it so one identifier's keys spread across nodes instead of piling

      # onto one. +suffix+ sits outside, so it cannot change the slot.

      def build_redis_key(rule, identifier, suffix = nil)

        key = "#{REDIS_KEY_PREFIX}:{#{@name}:#{rule.name}"

        rule.characteristics.each do |char|