8000 Improve upgrading instructions for deprecated router options · symfony/symfony@2cc7083 · GitHub
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Improve upgrading instructions for deprecated router options
See #30249 (comment)
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UPGRADE-5.0.md

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@@ -393,7 +393,7 @@ Routing
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* The `generator_base_class`, `generator_cache_class`, `matcher_base_class`, and `matcher_cache_class` router
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options have been removed.
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options have been removed. If you are using multiple Router instances and need separate caches for them, set a unique `cache_dir` per Router instance instead.
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* `Serializable` implementing methods for `Route` and `CompiledRoute` are final.
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Instead of overwriting them, use `__serialize` and `__unserialize` as extension points which are forward compatible
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with the new serialization methods in PHP 7.4.

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