Method _sync

src/core/core.datasetController.js:1041–1049

* @private

(args)

	 * @private
   */
  _sync(args) {
    if (this._parsing) {
      this._syncList.push(args);
    } else {
      const [method, arg1, arg2] = args;
      this[method](arg1, arg2);
    }
    this.chart._dataChanges.push([this.index, ...args]);
  }

  _onDataPush() {
    const count = arguments.length;