src/Bootstrap/Elements/CheckableButton.php
public function disabled($disabled = true)
    {
        $element = clone $this;
        return $disabled
            ? $element->controlAttribute('disabled', 'disabled')
            : $element->forgetControlAttribute('disabled');
    }
public function disabled($disabled = true)
    {
        $element = clone $this;
        return $disabled
            ? $element->controlAttribute('disabled', 'disabled')
            : $element->forgetControlAttribute('disabled');
    }
@param bool $disabled

@return static