@/callfunc transformation should honor the default values of a function

first of all: the current behavior is totally documented, you can treat this as a "feature request"/improvement.

Let's say I have this function in my component

sub myFunction(myFlag = true as boolean)
...
end sub

and I try to invoke it from the external with the @ syntax. I don't pass any value so I assume that myFlag is set to true

myComponent@.myFunction()

but bsc compiles the snippet to

myComponent.callfunc("myFunction", invalid)

witch translates to the runtime error: Type Mismatch. Unable to cast "roInvalid" to "Boolean".

Ideally, instead, the translation of @ should check if the first value of the function has a default value, and use it. In this case compiling to

myComponent.callfunc("myFunction", true)

Start with docs/callfunc-operator.md, especially the documented no-argument evaluation section, then trace bsc’s @/callfunc transformation for myComponent@.myFunction(). Done means the generated callfunc argument honors the function’s declared default instead of emitting invalid, with coverage for the example behavior.