docs: function getMembers(index) {
    if (this._members === undefined) {
      this._members = _(getValue(this, 'member') || getValue(this, 'memberOf'))
        .split(/,\s*/)
        .compact()
        .sort(util.compareNatural)
        .value();
    }
    var result = this._members;
    return index === undefined ? result : result[index];
  }