docs: private static String escape(String string) {
          StringBuilder sb = new StringBuilder((int) (string.length() * 1.1));
          for (int i = 0; i < string.length(); i++) {
              char c = string.charAt(i);
              switch (c) {
              case ',':
                  sb.append("=2C");
                  break;
              case '=':
                  sb.append("=3D");
                  break;
              default:
                  sb.append(c);
                  break;
              }
          }
          return sb.toString();
      }