• More efficient assignment of callbacks (using move semantics)
• Fixed handling of large messages (size is now stored in 64 bit integers instead of 32 bit integers)
• Fixed issue with message brokers without a max frame size (we incorrectly treated this as max=0, so nothing was sent)
• Fixed race condition when setting up a TCP connection
• Fixed destructor of the Tagger class (used for publish-confirms) to unregister the callbacks that were installed on the wrapped channel