src/vs/workbench/api/common/extHostNotebookDocument.ts/ExtHostNotebookDocument/_changeCellInternalMetadata
class ExtHostNotebookDocument:	private _changeCellInternalMetadata(index: number, newInternalMetadata: notebookCommon.NotebookCellInternalMetadata): void {
		const cell = this._cells[index];
		cell.setInternalMetadata(newInternalMetadata);
	}