docs: public void sendInteger4(int val) throws IOException {
      int4Buf[0] = (byte) (val >>> 24);
      int4Buf[1] = (byte) (val >>> 16);
      int4Buf[2] = (byte) (val >>> 8);
      int4Buf[3] = (byte) (val);
      pgOutput.write(int4Buf);
    }