docs: static void insertPreLongs(final WritableMemory wmem, final int preLongs) {
      final int curByte = wmem.getByte(PREAMBLE_LONGS_BYTE);
      final int mask = 0x3F;
      final byte newByte = (byte) ((preLongs & mask) | (~mask & curByte));
      wmem.putByte(PREAMBLE_LONGS_BYTE, newByte);
    }