Litipk\BigNumbers\Decimal::isNegative PHP Method

    public function isNegative()
    {
        return $this->value[0] === '-';
    }

 /**
  * Checks if the value represented by this object is negative
  *
  * @return bool
  */
 public function isNegative()
 {
     return $this->amount->isNegative();
 }