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# Upgrade to 1.4
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## Minor BC Break: `Doctrine\Common\Cache\FileCache#$extension` is now `private`.
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If you need to override the value of `Doctrine\Common\Cache\FileCache#$extension`, then use the
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second parameter of `Doctrine\Common\Cache\FileCache#__construct()` instead of overriding
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the property in your own implementation.
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## Minor BC Break: file based caches paths changed
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`Doctrine\Common\Cache\FileCache`, `Doctrine\Common\Cache\PhpFileCache` and
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`Doctrine\Common\Cache\FilesystemCache` are using a different cache paths structure.
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If you rely on warmed up caches for deployments, consider that caches generated
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with `doctrine/cache` `<1.4` are not compatible with the new directory structure,
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and will be ignored.
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