Using InputNumber in PrimeVue Forms creates an 'undefined' field in $form

[simon-mettler]

Describe the bug

Using InputNumber in PrimeVue Forms creates an 'undefined' field in $form.

<Form v-slot="$form">
    <InputNumber name="amount" />
</Form>

results in $form:

{ 
"valid": true,
  "amount": {
    "value": 5,
    "touched": false,
    "dirty": false,
    "pristine": true,
    "valid": true,
    "invalid": false,
    "error": null,
    "errors": []
  },
  "undefined": {
    "touched": false,
    "dirty": false,
    "pristine": true,
    "valid": true,
    "invalid": false,
    "error": null,
    "errors": []
  }
}

Pull Request Link

No response

Reason for not contributing a PR

• Lack of time
• Unsure how to implement the fix/feature
• Difficulty understanding the codebase
• Other

Other Reason

No response

Reproducer

https://stackblitz.com/edit/6jthrvfk?file=src%2FApp.vue

Environment

MacOS and Firefox/Chrome

Vue version

3.5.13

PrimeVue version

4.2.5

Node version

22.12.0

Browser(s)

No response

Steps to reproduce the behavior

1. Create a form using primevue forms.
2. Add a InputNumber field.

Expected behavior

No undefined item in $form when using a InputNumber field. $form object should only represent fields in the form.