Inter-Procedural Optimization and Derefinement https://www.playingwithpointers.com/ipo-and-derefinement.html (excellent post showing how combining optimzns can cause surprises)
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Some excellent safety improvements in C++26: hardening the standard library against out-of-bounds bugs, and a safer semantics for uninitialised local variables:
Excellent series on Self, both the programming model and the tool chain.
I love how opening an inspector on a value (e.g. nil) then shows a link to all occurrences of the value in other open inspectors!
The Matter protocol is excellent for puns.
"Does it Matter? It doesn't Matter."