[Bug Report] Cascader 级联选择器 的getCheckedNodes对int的数字进行了自动 1 导致前后数据不对应
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- Dominant language
- Vue
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Description
### Element UI version
2.15.8
### OS/Browsers version
版本 111.0.1661.62 (正式版本) (64 位)
### Vue version
2.7.14
### Reproduction Link
https://github.com/ElemeFE/element/issues/22478
### Steps to reproduce
当级联控件的options中包含int类型数字时,再通过getCheckedNodes获取选中数据, 这时候所以int类型被自动 1了,详见截图,地址:https://github.com/ElemeFE/element/issues/22478
### What is Expected?
当前级联控件的options JSON 字段数据是level=0(int),消费时,也应该是level=0(int)
### What is actually happening?
level=0 变成了 level=1 ,
level=1 变成了 level=2 ,
level=2 变成了 level=3
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