Regression v-model attr fallthrough for HOC component.

[AlexandreBonaventure]

Version

3.0.0-beta.19

Reproduction link

https://jsfiddle.net/kfLbdvct/4/
here if you change the repro to load beta.18 it works as expected

Steps to reproduce

1. Create a component that works with v-model
2. Create an HOC component of the previous component
3. use v-model on the HOC component

What is expected?

HOC component should forward the v-model value event to the child component

What is actually happening?

as per #1510
v-model event are not falling through anymore.
I thought this was actually a feature (not a bug), it was simplify a lot HOC creation by reducing boilerplate. I understand the reasoning behind the issue above, but I'm wondering if preventing v-model attr fallthrough in a HOC context was intentional.