gistfile1.php

<?php

                            array(
                                'spec' => array(
                                    'name'    => 'isParentUser',
                                    'type'    => 'Select',
                                    'options' => array(
                                        'label'         => 'Darf Benutzer anlegen',
                                        'value_options' => array(
                                            '' => 'Nein',
                                            'true'  => 'Ja'
                                        )
                                    )
                                )
                            ),
                            
                            +
                            
                array(
                    'name'        => 'isParentUser',
                    'filter'      => array(
                        array(
                            'name' => 'Boolean'
                        )
                    )
                ),
                
                
                returns 'true' and 'false' not true and false in form but works correct if it´s used direct
                
array(6) {
  ["username"] => string(12) "asdasdwsaf4"
  ["email"] => string(14) "asdad4@lala.de"
  ["email2"] => string(14) "asdad4@lala.de"
  ["role"] => string(3) "125"
  ["isParentUser"] => string(5) "false"
  ["parentUserId"] => string(0) ""
}