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cc #101
I'm experimenting with different formulations. Both the existing and this pr's implementations can compile into a memcpy, like they should, if the input is a cloned slice iterator. The main difficulty seems to be to make a good benchmark. Without "black_box"es, the benchmarks compile out (and that's normally a good sign in itself, the code is then transparent to the optimizer) and with too many black box calls, the optimizations are disabled.