/**
* @param self|int|string|float $arg
* @throws InvalidArgumentException
* @return int|float
*/
protected function valueToNumber($arg)
{
if ($arg instanceof self) {
return $arg->toInt();
}
return Math::parseNumber($arg);
}
protected function valueToNumber($arg)
{
if ($arg instanceof Money && !$arg->currency->isInterchangeable($this->currency)) {
throw new InvalidArgumentException("Currency {$arg->currency} is not compatible with {$this->currency}.");
}
return parent::valueToNumber($arg);
}
