import Foundation

func test(count: Int) -> UInt8 {
    precondition(count >= 1)

    let ptr = UnsafeMutableRawPointer.allocate(byteCount: count, alignment: 1)
    ptr.storeBytes(of: 0, toByteOffset: 0, as: UInt8.self)

    let data = Data(bytesNoCopy: ptr, count: count, deallocator: .none)
    ptr.storeBytes(of: 13, toByteOffset: 0, as: UInt8.self)
    return data[0]
}

for i in 1...24 {
    print("\(i): \(test(count: i))")
}