docs: protected final void skip_clob_close_punctuation() throws IOException {
          int c = skip_over_clob_whitespace();
          if (c == '}') {
              c = read_char();
              if (c == '}') {
                  return;
              }
              unread_char(c);
              c = '}';
          }
          unread_char(c);
          error("invalid closing puctuation for CLOB");
      }