void putAntiValue(short elisionCount, byte[] bytes) {
        preparePut();
        int start = _size;
        ensureFit(8 + bytes.length);
        _bytes[_size++] = (byte) CLASS_ANTIVALUE;
        Util.putShort(_bytes, _size, elisionCount);
        _size += Util.putBytes(_bytes, _size + 2, bytes) + 2;
        endVariableSizeItem(_size - start);
    }