src/Validator.php
public function lowerThan($field_name, $reference_value, $allow_null = false)
    {
        return $this->compareValues($field_name, $reference_value, $allow_null, function ($a, $b) {
            return $a < $b;
        }, "Value of '$field_name' is not lower than $reference_value");
    }
public function lowerThan($field_name, $reference_value, $allow_null = false)
    {
        return $this->compareValues($field_name, $reference_value, $allow_null, function ($a, $b) {
            return $a < $b;
        }, "Value of '$field_name' is not lower than $reference_value");
    }
{@inheritdoc}