src/vs/workbench/contrib/notebook/browser/viewModel/codeCellViewModel.ts/CodeCellViewModel/_ensureOutputsTop
class CodeCellViewModel:	private _ensureOutputsTop(): void {
		if (!this._outputsTop) {
			const values = new Uint32Array(this._outputCollection.length);
			for (let i = 0; i < this._outputCollection.length; i++) {
				values[i] = this._outputCollection[i];
			}

			this._outputsTop = new PrefixSumComputer(values);
		}
	}