To make sure we won't overflow, we need math/big from Go
inputString := "Ag==" // base64'd byte representation of number 2
// first base64 -> bytes
decodedBytes, _ := b64.StdEncoding.DecodeString(inputString)
// bytes -> big.Int
bigInt := new(big.Int)
bigInt.SetBytes(decodedBytes)
resultInt64 := bigInt.Int64() // == int64(2)
resultInt := int(resultInt64) // == int(2)
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