func (s *Scratch) Get(k string) interface{} {
	s.RLock()
	defer s.RUnlock()
	return s.values[k]
}
func (s *Scratch) Get(k string) interface{} {
	s.RLock()
	defer s.RUnlock()
	return s.values[k]
}
// Get returns a value previously set by Add or Set