method setup resets flag "submitted" to zero

[nicolasfranck]

When I run this code:

use strict;
use feature qw(:5.10);
use Data::MuForm;

my $form = Data::MuForm->new(
    field_list => [
        {
            type => "Text",
            required => 1,
            name => "name"
        }
    ]
);

$form->process(
    params => {},
    submitted => 1
);

say "errors: " . $form->has_errors();
say "validated: ". $form->validated();

it returns:

errors: 0
validated: 0

So it is both not valid, and has no errors: the situation when no validation has run yet.
After some code inspection I saw that the method setup resets the flag submitted
to 0 when the corresponding field value is not given:

https://github.com/gshank/data-muform/blob/master/lib/Data/MuForm.pm#L833

So validation is refused. But according to the documentation the flag submitted is used to force validation..
Wasn't that the way it worked in HTML::FormHandler?

Any idea?