Storybook Vue3 PropType Issue

Repository reproducing this issue.

npm install
npm run storybook

Then view the HelloWorld component docs (you'll get the same result as seen in ./issue.png).

Expected:

• When defining a prop with PropType as a string union type, the user should be able to select from the list of options on the autodocs page.

Actual:

• When defining a prop with PropType as a string union type, the data type is inferred as object, and you can not even enter the string value of the prop on the autodocs page as it expects an stringified object to be passed.