这里的sizeof(char)是不是有问题？

https://github.com/alibaba/havenask/blob/35344cbf0c5fb2445f183538ae9f329cdc35def2/aios/autil/autil/PackDataFormatter.h#L105

```
size_t offsetLen = baseAddr[offset];
char *offsetAddr = baseAddr + offset + sizeof(char);
size_t offsetEndCursor = offset + sizeof(char) + offsetLen * (varNum - 1);
```
看代码，感觉sizeof(char) 应该换成 sizeof(offsetLen)才对啊，这里的sizeof(char)是什么含义呢

Inspect line 105 of aios/autil/autil/PackDataFormatter.h and trace how offsetLen, offsetAddr, and offsetEndCursor represent the packed data layout. Compare the use of sizeof(char) with sizeof(offsetLen) and verify which byte width the format requires. Done means the offset calculations match the intended serialized layout and the concern is resolved.

Written by the indexing model from the issue text.