2024-08-28 02:05:39 +08:00

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icon: dot
title: Undefined Behaviour
---
These are the undefined behaviours of pkpy. The behaviour of pkpy is undefined if you do the following things.
1. Delete a builtin object. For example, `del int.__add__`.
2. Call an unbound method with the wrong type of `self`. For example, `int.__add__('1', 2)`.
3. Type `T`'s `__new__` returns an object that is not an instance of `T`.
4. Call `__new__` with a type that is not a subclass of `type`.