Encode cache values for SQLite with base64 to prevent failing on \0 characters #54178
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Fixes a Cache serialization issue when the cache store is sqlite3 and the cached/serialized object contains any private or protected methods/properties.
It also handles reading non-encoded (previous) cache from SQLite - if it doesn't detect
:or;, it doesn't to try tobase64_decodeand just serializes the value.Fixes #54082