字段名是filter[xname]， getFieldDecorator 总是产生嵌套结构，如何转义 " [ "和 " ] " 符号，

[fubd]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

getFieldDecorator 转义符号

What does the proposed API look like?

filter[xname] -> filter[xname]

[zombieJ]

v3 版本中不支持转义，需要自己换个字段名。
v4 中支持该写法。