Typed variable has wrong type if assigned from untyped function

[KoBeWi]

Godot version:
71d372a

Issue description:
This fails:

func test():
	return true

func _ready():
	var a: int = test()
	if a == 1:
		print("Ok?")

If the function is typed or you use var a: int = true, it will work. I'd expect that a typed variable is properly converted in all cases.

[bojidar-bg]

I think resolving this might indirectly lessen the effects of #24035.

[dalexeev]

This is a duplicate of #32905.

The error occurs only when a variable is declared in a certain way:

func test():
    return true

func _ready():
    var a: int = test()
    var b := test() as int
    var c := int(test())
    prints(a is int, b is int, c is int)
    # False True True