code: function(service, node) {
      Limiter.prototype.initialize.call(this, service, node)
      // cascade initialization
      this.policy.initialize(this, node)
  
      // manage state
      var stateKey = this.policy.stateKey
      if (!(stateKey in PolicyLimiter._state)) {
        PolicyLimiter._state[stateKey] = {}
      }
      PolicyLimiter._state[stateKey][this.selector.hash] =
        this.policy.initializeState(
          PolicyLimiter._state[stateKey][this.selector.hash])
    }
docs: ********************************************************************
  @inheritdoc