Additional arguments bound in a connect call that do not match the expected type on the receiving function fail silently

[mikemherron]

Godot version

3.3.2.stable.official

System information

Windows 10

Issue description

If additional arguments bound to a connect call do not match the expected type on the receiving function, they will be passed as null with no other error or runtime warning. I would expect at least an error to be reported in this case, similar to how errors are reported when the number of arguments on the function do no match the number provided at run time.

Steps to reproduce

See below code from the provided sample that reproduces the issue. Run the project, and press the button - 'Invalid get index 'some_data' (on base :'Nil').' will be reported as object is passed is as null - but I'd argue what should happen here is the signal handling function should not be called, an an error reported instead.

extends Node2D

var my_object : MyClass

func _ready():
	my_object = MyClass.new()
	my_object.some_data = "testing"
	
	#In the below connect call, we bind my_object, an instance of
	#MyClass, to the even handler invocation, but the handler function
	#expects an instance of MyOtherClass. This fails silently with "null"
	#being passed in to _on_button_press.
	
	# warning-ignore:return_value_discarded
	$Button.connect("button_down", self, "_on_button_press", [my_object])

func _on_button_press(object : MyOtherClass) -> void:
	print(object.some_data)

class MyClass extends Object:
	var some_data : String
	
class MyOtherClass extends Object:
	var some_data : String
	

Minimal reproduction project

TestConnectWrongType.zip

[kleonc]

Possibly a duplicate of #37312 (which seems to be fixed only for master).