src/vs/workbench/api/common/extHostNotebookKernels.ts/NotebookCellExecutionTask/mixinMetadata
class NotebookCellExecutionTask:	private mixinMetadata(mixinMetadata: NullablePartialNotebookCellInternalMetadata) {
		this.applyEdits([{
			editType: CellEditType.PartialInternalMetadata,
			handle: this._cell.handle,
			internalMetadata: mixinMetadata
		}]);
	}