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// rounding to the nearest integral value; if two values are equally near, rounds to the even one
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// rounding to the nearest integral value; if two values are equally near, rounds to the even one
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// equivalent a swizzle with descending indices, e.g. reserve(a, 3, 2, 1, 0)
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// equivalent a swizzle with descending indices, e.g. reserve(a, 3, 2, 1, 0)
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