I have been busy recently (doing C++-related stuff) and cannot find a spare time for preparing a decent blog post. I expect that to change in November. For the interim I am posting here my last year’s talk at code::dive: Faces of undefined behavior. It is relevant in the context of recent discussions about contracts in C++ and go-back-in-time optimizations.
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Andrzej's C++ blog 
We don’t always have all the time we would like to pursue our side projects. But I really appreciate all your contributions to your blog as well as the coding community! Keep it up 🙂