• [Driver] Increment retransmit count only if data was actually sent.
• [Cluster] Fix buffer reference for ClusterMarkFile. (#1753)
• [Cluster/Archive] Protect against access to the closed mark file.
• [Cluster/Archive] Prevent JVM crash when opening an old version of the mark file (i.e. without a message header).
• [C++ Wrapper] Add an AsyncDestination type definition to Subscription.h. (#1749)
• [C++ Wrapper] Change wrapper version of the Context so that it does not hold a pointer to the underlying C context and track the values directly on the object and pass them through during init. Keep the pointer to the C context on the Aeron object to be properly cleaned up. (#1730)
• [C] Check that an image exists in the Subscription when retaining/releasing. (#1752)