const digits = "0123456789abcdef"

// appendDecimal appends the decimal string representation of x to b.
func appendDecimal(b []byte, x uint8) []byte {
	// Using this function rather than strconv.AppendUint makes IPv4
	// string building 2x faster.

	if x >= 100 {
		b = append(b, digits[x/100])
	}
	if x >= 10 {
		b = append(b, digits[x/10%10])
	}
	return append(b, digits[x%10])
}