Impossible send null payload (tombstone) because interface Serializer do not allow return null

[Hubbitus]

Payload to send defined by serializer in the RdKafkaProducer::send:

        $payload = $this->serializer->toString($message);

Where serializer is the instance of a class, implementing Enqueue\RdKafka\Serializer interface. There method toString has signature:

    public function toString(RdKafkaMessage $message): string;

So, in my class, I just can't return null! Please change the return type to ?string.

Using nulls as payload is common practice also known as tombstones.

[stale]

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