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New RDB v7 opcode: RESIZEDB.
The new opcode is an hint about the size of the dataset (keys and number of expires) we are going to load for a given Redis database inside the RDB file. Since hash tables are resized accordingly ASAP, useless rehashing is avoided, speeding up load times significantly, in the order of ~ 20% or more for larger data sets. Related issue: #1719
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