Solution

[PrimaSB]

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[mateacademy-ai-mentor]

Review Summary

The implementation has a critical flaw in the comparison logic: the default compare function (a, b) => String(a) > String(b) returns true for equal elements, which violates the expected compare function contract and causes incorrect swapping during sorting. This breaks correct behavior for arrays containing duplicate or equal values. Additionally, there's a medium-severity out-of-bounds access: the inner loop condition j < copy.length allows access to copy[j + 1] when j is at the last valid index, resulting in undefined comparisons. Both issues must be fixed to ensure correctness — specifically, replace the default comparison with String(a).localeCompare(String(b)) or a proper -1/0/1 ternary, and change the inner loop bound to j < copy.length - 1. These are functional blockers, not stylistic preferences, so changes are required before approval.

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