This is is 3.2 port of #40147 since there are presumably going to be core changes that make these features inapplicable to 4.0.

I've created a demo of it:

Demo_GP22_3_2.zip

Relevant code samples:

# main.tscn
- Node (main.gd)
    - Node "MyGDClass" (MyGDClass.gd)
    - Node "MyVSClass" (MyVSClass.vs)
    - Node "MyCSClass" (MyCSClass.cs)

# MyGDClass.gd
extends Node
class_name MyGDClass, "res://skill.png"
func _ready():
    print("MyGDClass")

// MyCSClass.cs
using System;
using Godot;

[Global("MyCSClass", "res://skill.png")]
public class MyCSClass : Node
{
    public override void _Ready()
    {
        GD.Print("MyCSClass");
    }
}

VisualScript sample:

# main.gd
extends Node

onready var gd = $MyGDClass
onready var vs = $MyVSClass
onready var cs = $MyCSClass

func _ready():
	if gd is ScriptServer.MyGDClass:
		print("gd is MyGDClass")
	if vs.get_script() == ScriptServer.MyVSClass:
		print("vs is MyVSClass")
	if cs.get_script() == ScriptServer.MyCSClass:
		print("cs is MyCSClass")

Output:

MyGDClass
MyCSClass
MyVSClass
gd is MyGDClass
vs is MyVSClass
cs is MyCSClass

It seems as though the is keyword doesn't like to cooperate with non-GDScript script types on the right-hand side. Should I try to incorporate that into the feature? Iirc, it worked fine in my 4.0 demo project.