A weekly roundup of Rails codebase changes covering performance improvements, bug fixes, and deprecations. Highlights include anchoring regexp patterns in ActiveRecord::LogSubscriber#sql_color to avoid timeout issues, a fast path for string cache keys in ActiveSupport::Cache, predefined Postgres type OIDs to eliminate per-connection pg_type queries, deprecation of the MySQL strict option and PostgreSQL schema_order option, Unicode fix for Inflector#titleize, composite key fixes in associations, and the addition of an AGENTS.md guide for AI coding agents contributing to Rails.
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