Submit only dirty values 
Learn how to selectively submit dirty values.
We can filter elements which values should be submitted using formData:
vue
<Vueform :form-data="(form$) => {
  let formData = {}
  // Select only dirty elements
  Object.values(form$.elements$).forEach((el$) => {
    if (!el$.isStatic && el$.dirty) {
      formData = {
        ...formData,
        ...el$.requestData,
      }
    }
  })
  // Use `formatData` if defined
  if (form$.options.formatData) {
    formData = form$.options.formatData(formData)
  }
  // Add `formKey` if defined
  if (form$.formKey) {
    formData.formKey = form$.formKey
  }
  // Convert our data to `FormData` object
  return form$.convertFormData(formData)
}" />