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: "5" is text and 3 is a number. Python refuses to compare them with >.
The fix: return len([v for v in values if int(v) > threshold])
Remember: data from forms, files and JSON is often text. Convert it once, as soon as it arrives.
The pattern behind it: type errors.
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