src/vs/workbench/api/common/extHostTextEditor.ts/ExtHostTextEditorOptions/_setLineNumbers
class ExtHostTextEditorOptions:	private _setLineNumbers(value: TextEditorLineNumbersStyle) {
		if (this._lineNumbers === value) {
			// nothing to do
			return;
		}
		this._lineNumbers = value;
		this._warnOnError('setLineNumbers', this._proxy.$trySetOptions(this._id, {
			lineNumbers: TypeConverters.TextEditorLineNumbersStyle.from(value)
		}));
	}