Byte Arithmetic in Go Wraps Around

A byte can hold 0 through 255. When arithmetic on a byte goes past either end of that range, the result wraps around. You can think of the next value after 255 as returning to 0. in The Golang Official Documentation

package main
 
import "fmt"
 
func main() {
	const limit = 255
	var value byte = limit
	value++
	fmt.Println(value)
	value--
	fmt.Println(value)
}

Expected output:

0
255

value starts at 255. value++ adds one, giving 0; then value-- subtracts one from 0, giving 255. The two printed lines show both directions of the wrap. This is arithmetic on an existing byte variable, not an out-of-range constant in a declaration.