This is a PHP 8.0+ library for postal address manipulation, formatting, validation, and localization (i18n). It provides immutable address value objects (Address, AddressInterface), formatters for display and postal labels, validators (Symfony constraints), and repositories for countries, address formats, and subdivisions. The library bundles extensive static JSON data derived from CLDR (country names in 150+ locales) and Google's Address Data Service (address formats for 200+ countries, subdivisions for 62 countries). Key architectural patterns include the repository pattern for data loading, lazy-loaded subdivision collections, type-safe enumerations via AbstractEnum, and PSR-7-style immutable mutators. It is designed as a standalone Composer package with optional Symfony Validator integration, and is used in Drupal and Symfony applications. The code is well-structured, uses modern PHP features, and has solid test coverage.