func IntAppendUnique(vs []int, toAdd int) []int {
	if IntInclude(vs, toAdd) {
		return vs
	}

	return append(vs, toAdd)
}
// IntAppendUnique appends toAdd to the vs int slice if toAdd does not already
// exist in the slice. It returns the new or unchanged int slice.
IntAppendUnique appends toAdd to the vs int slice if toAdd does not already
exist in the slice. It returns the new or unchanged int slice.
// IntAppendUnique appends toAdd to the vs int slice if toAdd does not already // exist in the slice . It returns the new or unchanged int slice .
func IntAppendUnique(vs []int, toAdd int) []int {
	if IntInclude(vs, toAdd) {
		return vs
	}
	return append(vs, toAdd)
}
func IntAppendUnique ( vs [ ] int , toAdd int ) [ ] int { if IntInclude ( vs , toAdd ) { return vs } return append ( vs , toAdd ) }
IntAppendUnique appends toAdd to the vs int slice if toAdd does not already
exist in the slice.
IntAppendUnique appends toAdd to the vs int slice if toAdd does not already exist in the slice .