Setting "Date" type as props will infer to string in the setup function

[Zcating]

Version

3.0.2

Reproduction link

https://codesandbox.io/s/laughing-galois-gh0q4

Steps to reproduce

define props

{
  props: {
    date: Date
  },
  setup(props) {
    // string type
    props.date 
  }

What is expected?

props.date should be Date type

What is actually happening?

props.date is string type

[posva]

As a workaround you can do date: Date as PropType<Date>,

[vandelpavel]

I had the same problem and the workaround worked for me but i'm still interested on why that happen.
Just saw related issue #2676