can you add "name" thing to GuiObj class, or some unique thing about GuiObj instances?

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The name is accessible through GuiObjs class.
And you can store pointers to returned objects.

but i'm getting objects like Gui.desktop().child(index)
and it's a GuiObj
pointer
so i can't reach the name

In that case you could compare the memory address of the object, and compare it to the stored pointer from GuiObjs