- Fixed numerous bugs across ActiveSupport (nil backtrace handling, JSON duplicate keys, cache namespace reads, timezone after travel, MemoryStore write option, deprecation handling), Active Record (migration validation, association reload...
- Improved Active Storage preview processing, proxy controller behavior, direct upload forms, and ensured strict loading compatibility for preview variants.
- Adjusted Railties and Rails generators: ensured config.after_routes_loaded hook runs on boot, respected config.log level with BroadcastLogger, made isolated engines honor table name prefixes, and prevented bin/rails app:template from add...