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.
Subscriptions must not trigger any retained message publishes from the server.
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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.