static type arrya cannot understand extends(subclass)

[AkiYama-Ryou]

Tested versions

godot 4.2.2 statble

System information

windows 10

Issue description

godot support OOP, so we can extend class :But it seem like gotdot cannot understand class in container

Im not sure is this a feature?

Steps to reproduce

I have class A and B. Class B extend from A.
var a:A
var b:B
a=b
but this cannot pass:
var a:Array[A]
var b:Array[B]
a=b
error:Value of type "Array[B]" cannot be assigned to a variable of type "Array[A]"

Minimal reproduction project (MRP)

N/A

[dalexeev]

See:

• GDScript reference - Typed arrays
• Typed array function arguments don't accept typed arrays of subclass #83876
• Behavior of typed arrays godot-proposals#7364

This is not a bug. Arrays are passed by reference; they do not copy the entire content. Otherwise you would get:

var a: Array[Node2D]
var b: Array[Node]
b = a # Now `b` refers to the same array as `a`.
b.append(Label.new()) # Valid, `Label` is a subtype of `Node`.
print(a[0]) # Invalid, `Label` is **not** a subtype of `Node2D`.

Probably the only way this would work is if the GDScript supported read/write qualifiers. But it's too difficult.

Thanks for the contribution nonetheless!

[AkiYama-Ryou]

Thank you for explaining.