Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the mutation and copying bugs pattern
Assignment does not copy, a shallow copy still shares its contents, and mutating methods return None.
What went wrong: ^ is not power in Python. It compares the binary digits of two numbers, so 3 ^ 2 is 1.
The fix: return n ** 2
Remember: power is ** in Python and JavaScript, not ^.
The pattern behind it: mutation and copying bugs.
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