the fmoney mul function is called with wrong parameter count

mul is declared as

public function mul($multiplicand)
603 	    {
...
}

hard coded - 8 (probably precision)

410 	        $new_amount = $this->amount->mul($currency_value, 8)->div($new_currency_value, $new_precision+1)->round($new_precision);

$precision is passed again.

605 	        $new_amount = $this->amount->mul($multiplicand, $precision+1)->round($precision);