src/Number.php
public function neg()
    {
        if ($this->value === null) {
            return new FloatType($this->value);
        }

        return new FloatType($this->value * -1);
    }
public function neg()
    {
        if ($this->value === null) {
            return new FloatType($this->value);
        }

        return new FloatType($this->value * -1);
    }
Negation. Product is always FloatType.

@return FloatType