compat: v-model modifiers do not work on components

[markrian]

Vue version

3.5.13

Link to minimal reproduction

https://codepen.io/markrian/pen/mybremp

Steps to reproduce

Enter numbers into the inputs. The displayed bound values should be numbers, not strings.

For instance:

Expected	Actual

What is expected?

v-model modifiers should work when used on components under @vue/compat.

What is actually happening?

v-model modifiers do not work when used on components under @vue/compat.

System Info

No response

Any additional comments?

You can see the behaviour working as expected under Vue 2 and Vue 3 (proper).

It seems this behaviour was fixed on Vue 3 proper in #2348. Perhaps similar treatment needs to be done for __COMPAT__ code paths?

[markrian]

I have attempted a fix with #12654.