Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the type errors pattern
Totals that concatenate, sorts that put 10 before 9, comparisons that refuse to run.
What went wrong: The list.sort() method sorts the list in-place and returns None by design.
The fix: Use the built-in sorted() function, which returns a new sorted list: sorted(scores)
Remember: In Python, list.sort() mutates in-place and returns None; use sorted() to return a list.
The pattern behind it: type errors.
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