code: public final boolean isJsonAdaptable(final char ch) {
      return ch == '"' || ch == '\\' || ch == '/'
          || ch == '\b' || ch == '\f' || ch == '\n'
            || ch == '\r' || ch == '\t';
    }
docs: <p>Check if character need to be JSON adapted.
  I.e. if it is new line...</p>
  @param ch char to check
  @return if need to adapt