What problem does this feature solve?

V-model support for web components(tested with web component implemented with ionic's stenciljs compiler).

Does not work:

<ui-input v-model="mySelect" />

Works:

<ui-input :value="mySelect" @input="mySelect = $event.target.value" />

Can this be enabled to support ignored elements as well that have been declared with:

Vue.config.ignoredElements = [/^ui-/];

What does the proposed API look like?

Declaration

Vue.config.ignoredElements = [/^ui-/];

Usage

<ui-input v-model="mySelect" />