In-memory cache system

• plug your cold storage on it to eventually persist all setted data
• auto eviction by read count (LFU); only evicts persisted data
• retrieves all cache-miss from the cold storage
• "eventual" persistency (async if you will) allows for shorter set operation
• you will see everything you need to implement or use and a couple helpers func & struct in /storage

Don't use in production lol
Feel free to submit a PR or put a comment or whatever if you find a bug or wanna improve it somehow

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