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Also include a few stats.
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This was necessary for publishing will messages from the destructor of a client, when you're connecting two clients with a will, no clean session and the same ID.
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Shifting signed integers is undefined and only sometimes produced unexpected results. Was detected in packet identifiers in QoS testing.
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Also fixes not downgrading QoS on subscribe.
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https://github.com/halfgaar/FlashMQ/issues/2
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Unsubscribing paths that didn't exist caused creation of null nodes, which subsequent use of the tree crashed on.
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Found by quinox using AFL.
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Instead of getting it from the sender of a packet. Sometimes there was no sender. This fixes a crash on retained messages, because those newly created packets didn't have a sender to get the threaddata from. So, using a special object for it is easier and more robust.