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: "1234" is text and 1234 is a number. === checks the type too, so they are never equal.
The fix: return Number(typed) === saved;
Remember: convert form input to the right type before comparing.
The pattern behind it: type errors.
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