字符串转义字符有什么问题？

Question

以下表达

let qs = "\' \(loggedInUserSettingRecordName!) \'";

这样绘制出来：

(lldb) po qs
"\' 10208273026137463 \'"

为什么呢？ Swift文档说：

Special Characters in String Literals

    String literals can include the following special characters:

        The escaped special characters \0 (null character), \\ (backslash), \t (horizontal tab), \n (line feed), \r (carriage return), \" (double quote) and \' (single quote)

没有逃脱尝试：

let qs = "' \(loggedInUserSettingRecordName!) '";

结果：

(lldb) po qs
"\' 10208273026137463 \'"