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Avoid creating temporary arrays

Lukasa requested to merge lukasa/RediStack:cb-remove-intermediate-array-master into master

Motivation:

When we only want the first byte, rather than create temporary intermediate arrays we can just ask NIO to give us the first byte. This avoids unnecessary allocations.

Modifications:

  • Replace readBytes(length: 1).first with readInteger(as: UInt8.self)

Results:

11% performance improvement in load testing due to reduced allocator pressure on the hot path.

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