`boolean | null` prop doesn't accept `null` value

[jacekkarczmarczyk]

Version

2.7.14

Reproduction link

stackblitz.com

Steps to reproduce

// Comp.vue
defineProps<{ msg: boolean | null }>();

<!-- App.vue -->
<template>
  <Comp :msg="null" />
</template>

What is expected?

No warnings
Vue 3: https://sfc.vuejs.org/#__DEV__eNp9kLtuwzAMRX+F0JIEiKXdcAMU3Tq0BbpqcRzaVWA9QMkpClf/XqrpIw8gmy55eUWeWdyHIA8Tilo0sSMTEkRMU9hoZ2zwlODB2wA9eQsLqYoo9oV2jTr62ckioQ1jm5AVQNOVmbr3/k4LN42jFqC406g/m1iLY35l2yD30TveYC7D+qcRtajhu1Jq/GfRWrylFGKtVOy7ssg+Sk+D4pekySVjUWK01Zb8e0TiYC3WJxmKiwekitDtkJBuZV5Yr3JLbNYu8ym/WC4pwti6gRmUY/j+HfbG4Qv5EJsZGE8NW+9HbB18QuEEebNcnaH9BzvP8Pj6/CRjIuMG038sOWAFOZ9SzV97tqJr

What is actually happening?

Invalid prop type: "null" is not a constructor and Invalid prop: type check failed for prop "msg". Expected Boolean, , got Null warnings

Additional notes

Warnings per se are not the issue, they can be fixed by changing the prop definition to msg?: boolean which also accepts booleans, the issue is that this behaviour is not same as in Vue 3

[posva]

Duplicate of #9358 ?