Subscriptions must not trigger any retained message publishes from the server.
The server should always send all retained messages on topics that match a subscription's filter.
The server should send retained messages on topics that match the subscription's filter, but only for the first matching subscription, per session.
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Configures how retained messages should be handled when subscribing with a topic filter that matches topics with associated retained messages.
Enum values match MQTT5 spec encoding values.