set(n, callback) {
      if (n === undefined || isNaN(n)) {
        n = 0;
      }

      if (n > this.count || n < 0) {
        if (this.noWrap) {
          return;
        }

        n = this._wrap(n);
      }

      this._cycleTo(n, callback);
    }
Cycle to nth item
@param {Number} [n]
@param {Function} callback