- Numerous bug fixes across ActiveSupport and ActiveRecord, including cache fetch behavior, timezone preservation, message verifier/encryptor rotation, and handling of connection‑pool errors.
- Resolved edge‑case issues in ActionView, ActionPack routing, and database adapters (SQLite non‑finite values, PostgreSQL libpq version handling, MySQL inserts without RETURNING, and async SQL notifications).
- Security and stability enhancements such as improved exception reporting, graceful URL param handling, and loading secret_key_base from ENV or credentials.