public function data_is_countable_functionality() {
    return array(
      'boolean true'                     => array(
        'variable'     => true,
        'is_countable' => false,
      ),
      'plain stdClass object'            => array(
        'variable'     => new stdClass(),
        'is_countable' => false,
      ),
      'Array iterator object'            => array(
        'variable'     => new ArrayIteratorFakeForIsCountable(),
        'is_countable' => true,
      ),
      'Countable object'                 => array(
        'variable'     => new CountableFakeForIsCountable(),
        'is_countable' => true,
      ),
      'integer 16'                       => array(
        'variable'     => 16,
        'is_countable' => false,
      ),
      'null'                             => array(
        'variable'     => null,
        'is_countable' => false,
      ),
      'non-empty array, 3 items'         => array(
        'variable'     => array( 1, 2, 3 ),
        'is_countable' => true,
      ),
      'non-empty array, 1 item via cast' => array(
        'variable'     => (array) 1,
        'is_countable' => true,
      ),
      'array cast to object'             => array(
        'variable'     => (object) array( 'foo', 'bar', 'baz' ),
        'is_countable' => false,
      ),
    );
  }