docs: public final boolean addJsonChar(final char pCh,
      final StringBuffer pSb, final boolean pIsStartSpaces) {
      boolean isStartSpaces;
      if (pCh == ' ') {
        if (!pIsStartSpaces) {
          isStartSpaces = true;
        } else {
          return true; //it's continue spaces, so remove them
        }
      } else {
        isStartSpaces = false;
      }
      if (!isUseless(pCh)) { //JSP make a lot of useless new lines,
        //so they will be removed
        if (isJsonAdaptable(pCh)) {
          pSb.append('\\');
        }
        pSb.append(pCh);
      }
      return isStartSpaces;
    }