code: func (mem *memNamedMapping) ListAllNames() (names []string) {
  	mem.access.RLock()
  	defer mem.access.RUnlock()
  
  	var ret []string
  
  	for name := range mem.nameToIdx {
  		ret = append(ret, name)
  	}
  
  	return ret
  }
docs: // ListAllNames returns all names in the mapping.