Knowledge Fusion optional variable arguments

An optional argument ia defined by parenthesis (), and one or many
optional arguments are defined with … (three dots).

Example would be to have optional many arguments:

Defun: Average (Number … $nums)

This example if a function called “Average” with optional arguments of
type “Number” that can be one or many stored in a list called “$nums”.

One way to access the $nums is by creating an expression block:

@{
$total << loop {
for $num in $nums;
sum $num;
};

So in Knowledge Fusion it is possible to have a function with optional arguments and it is possible to have a function to allow one or many arguments. The design patterns I try to stick to does not have a need for variable arguments but the optional feature is nice if you can have default values then override if necessary.