GDScript: Don't make array literal typed in weak type context

[dalexeev]

We have an implicit treatment of an array literal as typed in a typed context. For example:

var a: Array
a = [1, 2, 3] # Untyped array.

var b: Array[int]
b = [1, 2, 3] # Typed array.

However, I noticed that this also happens in the case of a weak type:

var a: Array[int]
var b = a # b is "weak Array[int]".
b = [1, 2, 3] # Typed array.

Note: This may break code for users relying on this behavior, but I believe it's worth it, the current behavior is weird.

[adamscott]

Approved by the GDScript team. A non-typed variable should be treated as a Variant, not as a weak typed array.

Thanks again @dalexeev for your hard work!

[akien-mga]

Thanks!