Caching that's multi-process safe

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Problem

We have several cases where files need to be cached. These include at least: files that have been decompressed and responses from the web that can be cached using the HTTP/1.1 rules. We need for the caching to be both thread safe and multi-process safe. That is, the cache needs to be shared between processes that do not, otherwise, synchronize their operation.

Background

Proposed solution