PersistedCache backed by a KeyValueStore.layerFileSystem in a web scraper I am building. I have a few questions:TaggedRequest is persisted? For example, if I want to add metadata about the request like the time? Right now I just see [{"_tag":"Success","value": "some-html-string"}] with the TaggedRequest seen below.http://example.com/a/b/c -> /requests/a/b/c)?TaggedRequests, how would you deserialize them from the fs?PersistedCache metrics to monitor cache hits and misses?