perf(decode): pool rec buffer in unmarshalValue#55
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Replaces per-call make([]byte, 0, 64) with a sync.Pool of reusable recording buffers in unmarshalValue. Eliminates 1 alloc per Unmarshaler.UnmarshalMsgpack call. Oversized buffers (>4KB) are dropped to prevent unbounded pool growth. DecodeRaw is not pooled because the caller owns the returned slice.
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Summary
[]byterecording buffer used byunmarshalValueviasync.PoolUnmarshaler.UnmarshalMsgpackdecode callDecodeRawis not pooled since the caller owns the returnedRawMessagesliceBenchmark (no regression; Unmarshaler alloc savings not measured by existing benchmarks)
Test plan
go test -count=1 ./...— all passgo test -short -race -count=1 -timeout=5m ./...— no races