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: 0.1 + 0.2 is stored as 0.30000000000000004, so == says it is not 0.3.
The fix: import math and return math.isclose(a + b, expected)
Remember: don't compare decimal numbers with ==. Use math.isclose(), or work in whole cents.
The pattern behind it: type errors.
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<iframe src="https://trybughunt.com/embed/87d15479-e892-4a33-a869-0f8910d5eca9" title="Debugging challenge: Payment check says 0.1 + 0.2 isn't 0.3" width="100%" height="580" loading="lazy" style="border:1px solid #d4d4d8;border-radius:12px;max-width:760px"></iframe>
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