This is just astonishing.
Python 3.12.10 (tags/v3.12.10:0cc8128, Apr 8 2025, 12:21:36) [MSC v.1943 64 bit (AMD64)] on win32
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>>> -12 % 10
8
>>>
All the places where I'm using mod for "remainder after dividing by n" ... now it doesn't feel safe.