/**
* Compare to amount
*
* @param Amount $amount
* @param int $precision Optional decimal precision used in calculation
* @return int 0 if instance and $amount are equal, 1 if instance is larger, -1 otherwise.
*/
public function compareTo(Amount $amount, $precision = -1)
{
return bccomp($this->getAmount(), $amount->getAmount(), $precision >= 0 ? $precision : $this->getInternalPrecision());
}