binder.clear() should reset the default value to 'empty' and clear all validation errors

[vlukashov]

When calling binder.clear() I expect all form fields to be cleared and show no validation errors (as if the form was just rendered). I also expect that calling 'reset()' after 'clear()' is a no-op. In Flow 3.2.0.alpha7 this is not the case: binder.clear() clears all form fields, but does not reset the validation state, nor resets the form default value: