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These checks don't achieve anything of value. Assuming they were added to check for corruption, they don't actually achieve this goal since other parts of the data object can still get corrupted and we wouldn't notice unless we'd recalculate the hash every time. In theory, we could use the entry item hash to avoid a random access lookup for the data object hash in the journal file in the future to speed up searching, but for finding all entry objects containing a specific data objects, we already have entry arrays per data object to get fast access to this information. This means that duplicating the hashes in the entry item doesn't result in any added value. In this commit, we remove the checks so that in future commits we can remove the hashes from the journal file format in the new compact mode.