code: func (m *boxMap) Load(key string) (*Box, bool) {
  	i, ok := m.data.Load(key)
  	if !ok {
  		return nil, false
  	}
  	s, ok := i.(*Box)
  	return s, ok
  }
docs: // Load the key from the map.
  // Returns *Box or bool.
  // A false return indicates either the key was not found
  // or the value is not of type *Box