[Proposal] Add cache.ModifyFn and cache.GetOrSetFn #61
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ModifyFnis a very handy function can be used to simulateIncrement/Decrement,Set,GetOrSetor the added alongGetOrSetFn.GetOrSetFnallows us to calculate the new value lazily, only if the cache misses it.TODO:
ModifyFn?ModifyFnto make proper error handling possible?