code: @SuppressWarnings("unchecked")
      @Override
      public <T> T by(String name) {
          User user = api.getUserByName(name);
          return (user == null) ? null :
                  (T)user.getProperty(APIKey.USER);
      }
docs: /* (non-Javadoc)
  @see com.tvd12.ezyfox.core.command.GetUser#by(java.lang.String)