OP solved it, closing

Not a kata suggestion

That would require a repr() to get the value, if you simply want to do print(add(n)). The downside of that is it can only return a string type

def __repr__(self):
    return str(self.value)

Thanks, my bad. You rock.

You can? You are just missing __eq__ so the comparisons do not work

Why can't I use OOP (in Python) and make a class called Add() and use call() and repr()???
It perfectly satisfies the requirements with a factory function def Add() and is 100% legal.
Ridiculous.

Oh, i see, replacing operators is only for checking leading zeros. brilliant

I'm curious. What if the number is like "-?16" and replacing ? with "0" makes it "-016"?

Thanks for replying. I just deleted all my code in Kata and pasted it again from my IDE (0 changes made) and it passed.

I do not know what language you try, and I do not know your code, so I have really no way of checking why your solution fails.

My solution is working fine on VScode and i check all my individual functions, they all work fine but here in Codewars functions, these 4 tests always fail. Just what is going on???

(Python)
Answer for runes = '123?45*?=?' : -1 should equal 0
Answer for runes = '?*123?45=?' : -1 should equal 0
Answer for runes = '123?45+?=123?45' : -1 should equal 0
Answer for runes = '123?45-?=123?45' : -1 should equal 0

Even ChatGPT doesn't know what's going on. So either this is a Kata issue or some magic just doesn't allow me to pass this Kata. Since posting on Issues page normally will get shut down immediately :/ I'll post it here even though i believe this is pretty much a Kata issue

Totally forgot about substr

This is beautiful, and overlapping is naturally taken care of

Don't u need to update i after plateaus? Since you've already checked j more numbers after i?