code: private static void appendEscapedByte(StringBuilder builder, byte value) {
          builder.append('%');
          builder.append(HEX[(value >> 4) & 0x0f]);
          builder.append(HEX[value & 0x0f]);
      }
docs: Appends the byte as percent-encoded hex value (three characters).
  
  @param builder The builder to append to
  @param value   the type to be appended as percent-encoded