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So simple, and yet most C projects never do it.

Plain C strings all over the place.

Since I learnt C in 1990, knowing to count up to 10 is enough, for the amount of times I saw it actually being done.

The projects and people I follow do this all the time. Just like putting a size field near each regular non sentinel terminated array is useful. But if not doing it (maybe linux kernel in many cases), no big deal either, don't sweat the small stuff. String slices are small and rarely perf critical.

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