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4.0.0
Complete rebuild of the bundle around deterministic, request-scoped timezone resolution.
Requires PHP ^8.3 with Symfony ^7.4.13, or PHP ^8.4 with Symfony ^8.1.
Breaking: the guesser, provider, event and validator APIs of the 2.1/3.0 line are removed without a compatibility layer — see UPGRADE-4.0.md.
- Ordered, explicitly tagged resolvers with traceable results replace the guesser chain; every external timezone passes
TimezoneIdvalidation. - Only direct user preferences are persisted (session or signed HMAC cookie); GeoIP, locale and default results stay request-local.
- Request-scoped provider plus a bounded execution context instead of mutating PHP's global timezone — safe for Messenger workers.
- Opt-in browser sync (POST JSON, CSRF on by default), optional user/OIDC/MaxMind/Twig/Form/Messenger/profiler/console adapters.
Note: this release ships a documentation error — it points Symfony 6.4 users at the legacy 3.0 line, which cannot be installed there. Fixed in 4.0.1.
Full changelog: CHANGELOG.md