private function validateLowerThan(): bool
    {
        if ($this->options['max'] !== null) {
            if ($this->options['inclusive'] === false && $this->value >= $this->options['max']) {
                $this->setError(self::VALIDATOR_ERROR_NUMBER_MUST_BE_LOWER_THAN_MAX);
                return false;
            }

            if ($this->value > $this->options['max']) {
                $this->setError(self::VALIDATOR_ERROR_NUMBER_MUST_BE_LOWER_OR_EQUAL_TO_MAX);
                return false;
            }
        }
        return true;
    }