golang：有关字符串连接的特定问题

OK we already have the answer that StringBuilder should be used to concatenate strings in go:

How to efficiently concatenate strings in Go?

Now, I am reviewing a PR. There is this code:

const CustomerID [32]byte

const paymentPrefix = "payment_done_"
const sentPrefix = "invoice_sent_"
const receivedPrefix = "invoice_received_"

 
func paymentKey(customer CustomerID) string {
   return paymentPrefix + customer.String()
}

// same for the other two Key

I am wondering if I should request to use StringBuilder here

func paymentKey(customer CustomerID) string {
  var str string.Builder
  str.WriteString(paymentPrefix)
  str.Write(customer)
  return str.String()
}

It is a 32 byte ID which first needs to be converted to string and then concatenated with +

These are only two strings but potentially called a lot, that is why I think it is justified to question concatenation.