can't create a safe python class

numpy_poc example has the following class as an example of an unsafe class:

...
class Test(object):
    def __init__(self):
        self.a = 1

    def __reduce__(self):
        # Runs the other PoC found in /examples
        return (os.system, ("python pytorch_poc.py",))
...

removing the unsafe __reduce__ method from the class is not enough to make it safe:

...
class Test(object):
    def __init__(self):
        self.a = 1
...

$ python example/numpy_poc.py
...
Is this is_likely_safe?
❌

Is this behavior expected?

Start with example/numpy_poc.py, especially lines 9-15, and run the shown command after removing reduce. Compare the class behavior with the referenced pytorch_poc.py example and trace why is_likely_safe? still reports an unsafe result. Done when the behavior is explained and the expected handling is established.