Form validate issue

[cool-little-fish]

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

Version

2.0.0-beta.13

Environment

vue 3.0 chrome 86.0

Reproduction link

https://stackblitz.com/edit/vue-r8fryt?file=src%2Fcomponents%2FHelloWorld.vue

Steps to reproduce

click add button directly, compare the validating result of two input

What is expected?

height validate success

What is actually happening?

validate fail

---

hi..I find this is because the line 270 async-validator will give a default type. I think it's better make a waring for this situation, So I make a pr for this.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.