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: isinstance() requires multiple candidate types to be passed as a tuple, not as a list.
The fix: Use a tuple of types: isinstance(val, (int, float, str))
Remember: In Python, isinstance() accepts a single type or a tuple of types, but not a list.
The pattern behind it: type errors.
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