What happened?

Currently, if a value is changed to an empty object ({}), the isEqual util automatically assumes nothing has changed.

I think checking both objects and comparing their key counts would be a viable option to solving this without a noticable performance hit.

Reproduction steps

1. Create any form with initial values:

const form = useForm({
  initialValues: {
    a: {
      exists: true,
    }
  }
});

2. Empty the value of a

const [a] = form.defineField('a');
a.value = {};

3. Inspect form.meta.dirty, this should be true, but it is false

Version

Vue.js 3.x and vee-validate 4.x

What browsers are you seeing the problem on?

• Firefox
• Chrome
• Safari
• Microsoft Edge

Relevant log output

No response

Demo link

https://stackblitz.com/edit/vee-validate-issue-template-p3dgzu?file=src%2FApp.vue,src%2Fmain.ts

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