“Bookmark Link…”
  “Save Link As…”
  “Email Image…”
  “Set Image as Desktop Background…”
  “Bookmark Page…”
  ... we can’t get rid of these things by simply toggling some option in about:config ...

I don't really see/care where my mouse exactly is. If it is outside or inside the window. Once my cursor turns to resize cursor, I just start dragging.

  So imagine a technology that shines a laser on a car or a block of concrete and makes it blue

And here is a video explains it https://www.youtube.com/watch?v=RsGHr7dXLuI

  I had read an article about how DOOMs engine works and noticed how a variable for tracking the demo kept being incremented even after the next demo started. This variable was compared with a second one storing its previous value

  The comments show the values each thread observed.

You would need additional mechanisms (an extra atomic that you compare_exchange) to force order

edit: but I guess the comment means it is the thing author wants to observe

  Now, the big question: is this execution even possible under the C++ memory model?

  struct MyStruct
  {
    int x = 5;
  };
  ...
  MyStruct myStructs[100];

I even showed msvc assembly output and pointed to the place where it is looping & assigning all x values and then it started hallucinating about msvc not conforming the standards. Then I did it for gcc and it said the same. It was surreal how strongly it believed it was correct.

  @copilot please remove all tests and start again writing fresh tests.

  The general cost over a several large codebases has been observed to be minimal

Not to mention if you change every int a to int a=0 right now, in those code bases, a=0 part will likely to be optimized away since that value is not being (shouldn't be) used at all and likely will be overwritten in all code paths

  Of course we should provide a mechanism to allow large arrays to remain uninitialized, but this should be an explicit choice, rather than the default behaviour.

  const string input = "interesting";
  bool comparison = input.ToUpper() == "INTERESTING";
  Console.WriteLine("These things are equal: " + comparison);
  Console.ReadLine();

If you are doing such things then it looks more like a code smell.