Given confluent-kafka-dotnet is wrapping librdkafka I am not sure how feasible this suggestion is.

An approach which could work would be to change ISerializer and IAsyncSerializer to return ArraySegment<byte> rather than byte[]. This would at least allow apps to use pooled arrays or circular buffers, to achieve something closer to zero-allocation serialization when publishing to Kafka. The ArraySegment can easily map to a call to SafeKafkaHandle.Produce which accepts an array, an offset and a length

SerializationContext #1238

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