1.

func String2ByteSlice(s string) []byte {
    return (*[^uint(0) >> 1]byte)(unsafe.Pointer(&s))[:len(s):len(s)]
}

2.

func String2ByteSlice(s string) []byte {
    return *(*[]byte)(unsafe.Pointer(&struct{string; int}{s, len(s)}))
}

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