static public function integerish($value, $message = null, $propertyPath = null)
        {
            if (strval(intval($value)) != $value || is_bool($value) || is_null($value)) {
                $message = $message ?: sprintf(
                    'Value "%s" is not an integer or a number castable to integer.',
                    static::stringify($value)
                );

                throw static::createException($value, $message, static::INVALID_INTEGERISH, $propertyPath);
            }
        }