File reads, reversing a slice

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In the second snippet, buf’s size is always 4096, so if n < 4096 then the first element becomes the element at index 4095 after reverse!, not index n - 1. I believe all you need to do is:

loop do
	buf = Slice(UInt8).new(4096)
	n = infile.read(buf)
	break if n == 0
	outfile.write(buf[0...n].reverse!)
end