Even if I passed a type to useform, form.validateFields Always return Store type

[Mamba-working]

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

Reproduction link

Steps to reproduce

Even if I passed a type to useform, form.validateFields Always return Store type

What is expected?

const [form] = useForm()
form.validateFields.then(res => {
const values = res; // values is IForm
})

What is actually happening?

Type is Store

Environment	Info
antd	4.7.1
React	16.13.1
System	mac os Catalina 10.15.7
Browser	IE Edge 86.0.622.48

[zhuyunhe]

4.6.1 still has this issue