According with the documentation
http://book.cakephp.org/3.0/en/views/helpers/form.html#options-for-select-checkbox-and-radio-inputs
I use "HiddenField" to create a hidden input with value 0.. Like this
echo $this->Form->Label("Stats ");
echo $this->Form->checkbox('stats', [
'value' => '1',
'hiddenField' => '0',
]);
My HTML (there is no hidden field) as it should:
<input type="checkbox" name="stats" value="1" required="required">
I did it yesterday, but today it's not working and i have not updated the cake version.. NOTHING, Crazy :\