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Convert an Integer to bytes
func bytes<T: IntegerType>(i: T) -> [UInt8] {
let p = UnsafeMutablePointer<T>.alloc(1)
p.memory = i
let b = unsafeBitCast(p, UnsafePointer<UInt8>.self)
let bytes = reduce(0..<sizeof(T), []) { $0 + [b[$1]] }
return bytes
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