AdamWathan\Form\Elements\Checkbox::checkBinding PHP Method

    protected function checkBinding()
    {
        $currentValue = (string) $this->getAttribute('value');
        $oldValue = $this->oldValue;
        $oldValue = is_array($oldValue) ? $oldValue : [$oldValue];
        $oldValue = array_map('strval', $oldValue);
        if (in_array($currentValue, $oldValue)) {
            return $this->check();
        }
    }