src/Number.php
public function sub($value)
    {
        $value = Cast::Float($value);

        if ($this->value === null) {
            return new FloatType($this->value);
        }

        return new FloatType($this->value - $value);
    }
public function sub($value)
    {
        $value = Cast::Float($value);

        if ($this->value === null) {
            return new FloatType($this->value);
        }

        return new FloatType($this->value - $value);
    }
public function sub ( $ value ) { $ value = Cast :: Float ( $ value ) ; if ( $ this -> value === null ) { return new FloatType ( $ this -> value ) ; } return new FloatType ( $ this -> value - $ value ) ; }
Subtraction. Product is always FloatType.

@param  mixed $value
@return FloatType
Subtraction . Product is always FloatType .