Braintree\Customer::isEqual PHP Method

returns false if comparing object is not a Customer, or is a Customer with a different id

public isEqual ( object $otherCust ) : boolean
$otherCust	object	customer to compare against
return	boolean

    public function isEqual($otherCust)
    {
        return !$otherCust instanceof Customer ? false : $this->id === $otherCust->id;
    }

Customer