docs: private String renderArgument(Object argument)
      {
          if (argument == null)
          {
              return "null";
          }
          else if (argument instanceof String)
          {
              return "\"" + argument + "\"";
          }
          else if (argument instanceof Character)
          {
              return "\'" + argument + "\'";
          }
          else
          {
              return argument.toString();
          }
      }