Weekly Rails changelog covering security releases (7.2.3.1, 8.0.4.1, 8.1.2.1) and bugfix releases (8.0.5, 8.1.3). Notable changes include: `validates` now combines top-level and per-validator `:if`/`:unless`/`:on` options instead of silently overriding; `titleize` now correctly capitalizes Unicode characters; and MySQL's ER_NO_DB_ERROR is now classified as `ActiveRecord::ConnectionFailed` for automatic retry.
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