whole_func_string: function(user, overwrite){
              var uid = user.identifier, ow = overwrite || false;
              if(!!uid){
                  if(!this.users[uid] || !!ow){
                      this.users[uid] = user;
                  }
              }
          }
func_code_string: function(user, overwrite){
              var uid = user.identifier, ow = overwrite || false;
              if(!!uid){
                  if(!this.users[uid] || !!ow){
                      this.users[uid] = user;
                  }
              }
          }
func_documentation_string: other helpers