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When a client sends the <resume/> for XEP-0198, its "h" count is validated, and this count is always rejected - as such resumption is impossible.
This is because it's validated against the current session, and not the "other" session that is to be resumed. Somehow I missed that in the review.
When a client sends the <resume/> for XEP-0198, its "h" count is validated, and this count is always rejected - as such resumption is impossible.