Restore caching of download failures #501
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This re-applies the changes in #484, with one difference: Download failures are stored as
CacheStatus::Malformedinstead ofCacheStatus::Negative.This is meant to be a stopgap against repeatedly re-downloading files. A known caveat to the changes in this diff is that it is currently not possible in a cached failure to distinguish between download failures and malformed object files. A follow-up PR that attempts to address that drawback will be opened later.