chenBright opened a new pull request, #2035:
URL: https://github.com/apache/incubator-brpc/pull/2035
### What problem does this PR solve?
Issue Number:
Problem Summary:
目前打开single_repeated_to_array开关后，pb转json只支持root
case，但是打开array_to_single_repeated开关，json转pb没有限制root
case。这样会导致json转pb，pb再转回json，前后的json结构发生了变化，不符合预期。例如：
```
# pb
meesage Single {
repeated int ids;
}
message Test {
Single single;
}
# 打开array_to_single_repeated开关后，以下json可以转为Test
{
"ids": [1,2,3]
}
# 但是打开single_repeated_to_array开关后，Test转为json的格式为：
{
single: {
"ids": [1,2,3]
}
}
```
### What is changed and the side effects?
Changed:
Side effects:
- Performance effects(性能影响):
- Breaking backward compatibility(向后兼容性):
如果旧代码希望array_to_single_repeated将非root array转成single
@repedted的话，使用此PR代码后，会导致json转pb失败。
---
### Check List:
- Please make sure your changes are compilable(请确保你的更改可以通过编译).
- When providing us with a new feature, it is best to add related
tests(如果你向我们增加一个新的功能, 请添加相关测试).
- Please follow [Contributor Covenant Code of
Conduct](../../master/CODE_OF_CONDUCT.md).(请遵循贡献者准则).
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