{"id":"valid-palindrome-case-insensitive-at-compare","text":"Case normalization happens at comparison time via `.lower()`, not by preprocessing the entire string — the original string is never mutated or copied.","truth_value":"IN","source":"entries/2026/06/06/valid-palindrome-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"valid-palindrome-case-insensitive-at-compare","truth_value":"IN","reason":"premise"}]}}