[html-formfu] form still valid after force_error()

[Steve Caldwell]

In the script below, I'm forcing an error on an otherwise successfully
submitted form, using force_errors(), as laid out in the Cookbook.
However, after doing so, the form is still returning true when calling
submitted_and_valid().  Shouldn't force_errors() result in has_errors()
returning true (and thus submitted_and_valid() returning false)?

#!/usr/bin/perl
use HTML::FormFu;
use YAML;

my $form = new HTML::FormFu;
$form->populate(YAML::Load(<<"EOM"));
elements:
  - type: Text
    name: bar
    constraints:
      - type: Required
        message: Missing
  - type: Checkbox
    name: foo
    value: 1
    constraints:
      - type: Callback
        message: You can't do that
  - type: Hidden
    name: submitted
    value: 1
indicator: submitted
EOM

$form->process({
  bar       => 'baz',
  submitted => 1,
});

$form->get_field('foo')
    ->get_constraint({type => 'Callback'})
    ->force_errors(1);

$form->process();

print $form->submitted_and_valid ? "Success\n" : "Failure\n";

print $form;