code: function RollingFilter(items, rate) {
    if (!(this instanceof RollingFilter))
      return new RollingFilter(items, rate);
  
    this.entries = 0;
    this.generation = 1;
    this.n = 0;
    this.limit = 0;
    this.size = 0;
    this.items = 0;
    this.tweak = 0;
    this.filter = DUMMY;
  
    if (items != null)
      this.fromRate(items, rate);
  }
docs: A rolling bloom filter used internally
  (do not relay this on the p2p network).
  @alias module:utils.RollingFilter
  @constructor
  @param {Number} items - Expected number of items.
  @param {Number} rate - False positive rate (0.0-1.0).