This is supposed to be a help for compilers to apply optimizations on functions where they can't determine whether they are const/pure on their own. For static, local functions the compiler can do this on its own easily however, hence the decoration with pure/const is just noise. Let's drop it, and let the compiler to its thing better. (Use it for exported functions, since compilers can't 'reach-over' into other modules to determine if they are pure, except if LTO is used)
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