Can I use _instance.exposed.func() at Custom Elements?

[quietnumeric]

I' m generating custom elements by defineCustomElement(arg: VueComponent).
I know I can call [this|element]._instance.exposed.func when defined defineExpose({ func }) at Vue3 script setup.
Is this something that can be used stably?

document.getElementById('custom-element')._instance.exposed.func();

or

class CustomElementHasMethods extends CustomElement {
  methodName(arg) {
    return this._instance.exposed.func(arg);
  }
}

document.getElementById('custom-element').methodName();

I know instantiating _instance has a few delay time.

[LinusBorg]

It's an internal property (recognizable by the leading underscore), so we won't give you any guarantees that is stays stable. It's not very likely that we find a reason to rename or change it, though when we do, it won't be announced and your code will break suddenly.

[quietnumeric]

You're right, indeed.