Configure Ejabberd PubSub to deliver all (not just last) missing offline msgs

So far I've gotten Ejabberd PubSub to deliver the last 1 msg the user is missing. How can I configure ejaberd PubSub to deliver all the messages the user missed when offline?

I've gotten delivery of all offline msgs using regular and MUC but not with PubSub. I need PubSub rather than MUC for other key reasons, So please dont suggest switching to MUC.

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