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The cache object API for implementing caches. The default is a thread
safe in-memory dictionary.
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In this variant, the body is not stored mixed in with the metadata, but is
passed in (as a bytes-like object) in a separate call to ``set_body()``.
That is, the expected interaction pattern is::
cache.set(key, serialized_metadata)
cache.set_body(key)
Similarly, the body should be loaded separately via ``get_body()``.
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Return the body as file-like object.
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