v1.2.1 - Critical Safety and Performance Fixes

Hotfix Release

Security & Safety Fixes

• Fixed unsafe byte-to-string conversion - Replaced unsafe pointer manipulation with safe string() conversion, eliminating undefined behavior risks

Performance Improvements

• Optimized HasCommonElement - Improved from O(n×m) to O(n+m) using map-based approach
• Optimized DeDupBig - Now uses map[string]struct{} for better memory efficiency

Bug Fixes

• Fixed ContainsAnySubstring - Now properly skips empty substrings instead of always returning true
• Fixed DeDupBig confusion - Replaced misleading visited[k] = found pattern with clear visited[k] = struct{}{}

Testing

• Added comprehensive test cases for empty string edge cases
• Achieved 98.9% test coverage
• All tests passing, linter clean

Dependencies

• No dependency changes