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4e223b95a7
Looking at generated assembly, it turns out the optimizer is not smart enough to get rid of the loop - use `copyMem` instead. At least the compiler is smart enough to constant-propagate runtime endian direction, resolving the review comment. Also clarify why a minimum length is enfored - it could perhaps be revisited, but that would leave a slightly odd API. the `array` overloads are actually unnecessary with an optimizing compiler - as long as it can prove the length, any extra checks will go away on their own also add `initCopyFrom` * document optimizations