Setter function fails silently if called with incorrect type, assignment ignored without warning

[MFikretY]

Godot version:
3.3 stable

OS/device including version:
Windows 10

Issue description:
If the input type is defined for a setter function, it fails silently if given another type . No error is thrown, no warning given, and the assignment is completely ignored. Note that this only occurs if the setter is called implicitly, see steps below.

Steps to reproduce:

Upon defining a class like so:

class_name ObjectTest

var test_var : int = 10 setget test_set, test_get

func test_set(input_string : int):
	print("Set invoked")
	test_var = input_string
	
func test_get():
	print("Get invoked")
	return test_var

And calling from another script like so:

func _ready():
 	var obj = ObjectTest.new()
 	obj.test_var = "Hello"  # IGNORED
	print(obj.test_var)

The output is:

Get invoked
10

Note that "Set invoked" is not shown, so the setter has not run at all.

Project zip:
setter_bug.zip

[akien-mga]

Fixed by #54117.