[9.x] Fix ViewErrorBag for JSON session serialization #42090
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The
jsonsession serialization format added in Laravel 9 (#40595) doesn't work for flashed validation errors since those are serialized from the ViewErrorBag instance.ViewErrorBagdoes not implement JsonSerializable and more importantly need to be recreated when reading the session data back.This PR intends to resolve this by storing the necessary information as an array, and rehydrating the instance after reading the session data back. This tries to implement the suggestion by Taylor here: laravel/laravel#5796 (comment)
Note that this changes nothing unless
$serialization === 'json'.Fixes #40773
Related to #41850