vex.close could cover submission

[Raven0us]

Using

"vex-dialog": {
      "version": "1.1.0"
}

"vex-js": {
      "version": "4.1.0"
}

There could be an easy alternative to vex.close() that would gather the form data before closing the pop-up, either a separate method like vex.submit(), or vex.close(bool shouldSubmit), that wouldn't count as cancel.

Currently, programmatically, I can only do

el.dispatchEvent(new Event('submit'));

with el being the form, in order for the onSubmit handler to run and the provided callback to work properly.