### Godot version

v4.1.2.rc1.official [58f0cae4a] and v4.2.dev5.official [e3e2528ba]

### System information

Godot v4.1.2.rc1 - Windows 10.0.19044 - Vulkan (Compatibility) - NVIDIA GeForce GTX 1650 (NVIDIA; 31.0.15.3742) - AMD Ryzen 5 3550H with Radeon Vega Mobile Gfx (8 Threads)

### Issue description

Clearing one of the values of a typed array in the inspector seems to just unreference value and not set it to `<null>`, so the value becomes `<Object#null>`. Array's find function seems to look for the `<null>` value and doesn't accept `<Object#null>`, even if in GDScript `<Object#null>` == `<null>`. So, when calling array.find(null) in the tool script, the function can't find anything. When the project is restarted or you run it, the values that were equal to `<Object#null>` will become `<null>`.
![image](https://github.com/godotengine/godot/assets/118438257/208dbf2c-19ea-4d97-9e46-646662cb5122)

### Steps to reproduce

1. Export a typed array of Resource or any of the types that inherit from it;
2. Set one of the values of a typed array to anything;
3. Clear the value;
4. Use array.find(null) in any of the tool scripts.

### Minimal reproduction project

[ArrayBug.zip](https://github.com/godotengine/godot/files/12789530/ArrayBug.zip)
container->set_theme_type_variation("MarginContainer4px");
			add_child(container);
			set_bottom_editor(container);
			VBoxContainer *vbox = memnew(VBoxContainer);
			container->add_child(vbox);
			property_vbox = memnew(VBoxContainer);
			property_vbox->set_h_size_flags(SIZE_EXPAND_FILL);
			vbox->add_child(property_vbox);
			paginator = memnew(EditorPaginator);
			paginator->connect("page_changed", callable_mp(this, &EditorPropertyLocalizableString::_page_changed));
			vbox->add_child(paginator);
		} else {
			
			for (int i = property_vbox->get_child_count() - 1; i >= 0; i--) {
				property_vbox->get_child(i)->queue_free();
			}
		}
		int size = dict.size();
		int max_page = MAX(0, size - 1) / page_length;
		page_index = MIN(page_index, max_page);
		paginator->update(page_index, max_page);
		paginator->set_visible(max_page > 0);
		int offset = page_index * page_length;
		int amount = MIN(size - offset, page_length);
		for (int i = 0; i < amount; i++) {
			String prop_name;
			Variant key;
			Variant value;
			prop_name = "indices/" + itos(i + offset);
			key = dict.get_key_at_index(i + offset);