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This module contains multithread-safe cache implementations.

All Caches have

    getorbuild(key, builder)
    delentry(key)

methods and allow configuration when instantiating the cache class.
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s				tBuildcostAccessCachecBseZdZd�ZRS(s� A BuildTime/Access-counting cache implementation.
        the weight of a value is computed as the product of

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AgingCachecBs/eZdZddd�Zd�Zd�ZRS(s; This cache prunes out cache entries that are too old.
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