code: function FilterloadMessage(arg, options) {
    Message.call(this, options);
    this.command = 'filterload';
    $.checkArgument(
      _.isUndefined(arg) || arg instanceof BloomFilter,
      'An instance of BloomFilter or undefined is expected'
    );
    this.filter = arg;
  }
docs: Request peer to send inv messages based on a bloom filter
  @param {BloomFilter=} arg - An instance of BloomFilter
  @param {Object} options
  @extends Message
  @constructor