Implement index operators for Arrays

test/demo/main.gd

@@ -13,6 +13,7 @@ func _ready():
 	var ref = ExampleRef.new()
 	prints("sending ref: ", ref.get_instance_id(), "returned ref: ", $Example.extended_ref_checks(ref).get_instance_id())
 	prints("vararg args", $Example.varargs_func("some", "arguments", "to", "test"))
+	prints("test array", $Example.test_array())
 
 	# Use properties.
 	prints("custom position is", $Example.group_subgroup_custom_position)