userEvent.upload(input, file) seems by pass the form validity check

just recently pay more effort into react library & javascript development for the past few months.

I wonder below line would causing problem for validity() routine call in HTMLInputElement-impl.js
https://github.com/testing-library/user-event/blob/63ac399e06bd8f2397a6c581915acd29235f2d38/src/utils/edit/setFiles.ts#L45

  Object.defineProperties(el, {
    files: {
      configurable: true,
      get: () => files,
    },

https://github.com/jsdom/jsdom/blob/ff2bec0633095efeba38ba14fbdaaa2938660dcf/lib/jsdom/living/nodes/HTMLInputElement-impl.js#L959

            // https://html.spec.whatwg.org/multipage/input.html#file-upload-state-(type=file)
            // Constraint validation: If the element is required and the list of selected files is
            // empty, then the element is suffering from being missing.
            case "file":
              if (this._required && this.files.length === 0) {
                return true;
              }

I can't really get to pass the form.validity() check after done the userEvent.upload(element, files) call

simple snippet to simulate, by right, that only file upload input in the form should be valid

test('file upload', async () => {
    const user = userEvent.setup()
    render(<form aria-label='upload form'>
        <input type="file" name="upload-file" role="button" required="true" accept='image/*' aria-label='upload image'></input>
    </form>)

    const file = new File([Uint8Array.from(atob('/9j/4AAQSkZJRgABAQEAAAAAAA=='), c => c.charCodeAt(0)).buffer], 'test.jpg', { type: 'image/jpeg' })

    const input = screen.getByRole('button', {name: 'upload image'})
    await user.upload(input, [file])
    expect(input.files[0]).toEqual(file)

    const form = screen.getByLabelText('upload form')

    expect(form.checkValidity()).toBeTruthy()
    expect(Array.from(form.elements).filter(v => !v.validity.valid)).toHaveLength(0)
})

Reproduce the issue with the provided test in the userEvent.upload path, starting at src/utils/edit/setFiles.ts and comparing its files property behavior with jsdom's HTMLInputElement-impl.js validity check. Confirm whether the required file input remains invalid after upload, then add or update coverage for the form validity expectation so the upload and validity checks both pass.