Sun, 2 Sep 2018 10:22:40 +0200
Emmanuel Gil Peyrot <linkma...@linkmauve.fr> wrote:

> This is wrong, XEP-0045 notes that RFC6121 mandates that a server
> would broadcast an unavailable presence to all previous directed
> presence targets, this means the server MUST track them

Well now this is wrong :) The server only tracks presence's recipient
JID, it doesn't store full presence stanza, because this is not cheap.
This is enough to send presence-unavailable, but it's not enough for
stanza resending (for example, caps information will be lost).
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