code: func (mem *memNamedMapping) GetValue(name string) (value interface{}, exists bool) {
  	mem.access.RLock()
  	defer mem.access.RUnlock()
  
  	item, found := mem.nameToIdx[name]
  	if found {
  		return item.value, found
  	}
  	return
  }
docs: // GetValue looks up an item in the mapping by <name> (primary index).