goto Error
		}

		if n >= cutoff {
			// n*base overflows
			n = 1<<64 - 1
			err = strconv.ErrRange
			goto Error
		}
		n *= uint64(base)

		n1 := n + uint64(v)
		if n1 < n || n1 > maxVal {
			// n+v overflows
			n = 1<<64 - 1
			err = strconv.ErrRange
			goto Error
		}
		n = n1
	}

	return n, nil

Error:

		// we don't need to worry about partial overlaps. The two Ts must either be
		// in disjoint (nonoverlapping) memory or in exactly the same location.
		// There are 2 cases where this isn't true:
		//  1) Using unsafe you can arrange partial overlaps.
		//  2) Since Go 1.17, you can use a cast from a slice to a ptr-to-array.
		//     https://go.dev/ref/spec#Conversions_from_slice_to_array_pointer