func (us *unsafeSet) Contains(value string) (exists bool) {
	_, exists = us.d[value]
	return exists
}
func (us *unsafeSet) Contains(value string) (exists bool) {
	_, exists = us.d[value]
	return exists
}
func ( us * unsafeSet ) Contains ( value string ) ( exists bool ) { _ , exists = us . d [ value ] return exists }
// Contains returns whether the set contains the given value
Contains returns whether the set contains the given value