docs: public Word07Writer flush(OutputStream out, boolean isCloseOut) throws IORuntimeException {
  		Assert.isFalse(this.isClosed, "WordWriter has been closed!");
  		try {
  			this.doc.write(out);
  			out.flush();
  		} catch (IOException e) {
  			throw new IORuntimeException(e);
  		} finally {
  			if (isCloseOut) {
  				IoUtil.close(out);
  			}
  		}
  		return this;
  	}