[Python] How to pass a python object using user_data with a callback to another function?

I'm trying to use the callback & user_data parameters to call a function and pass an integer to it (in this case it's a list index) but when I print the contents of the passed variable it instead contains the tag of the button the callback originates from.

An example (without the unnecessary extra stuff):

import dearpygui.dearpygui as dpg

for index in range(N):
with dpg.group(horizontal=True):
dpg.add_button(label="add", tag="add_btn_"+str(index))
dpg.set_item_callback(item="add_btn_"+str(index), callback=add_something)
dpg.set_item_user_data(item="add_btn_"+str(index), user_data=index)


Where add_something() is just:

def add_something(user_data):
print(f"add_something: {user_data}")


For now, all the function it's calling does is print the user_data argument to the console. I'm expecting that to be the value of index but it actually prints the button tag: add_btn_0 (for example). Even when I set the user_data to a static string it still doesn't pass the correct data.

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