docs: public ExcelWriter write(Iterable<?> data, boolean isWriteKeyAsHead) {
  		Assert.isFalse(this.isClosed, "ExcelWriter has been closed!");
  		boolean isFirst = true;
  		for (Object object : data) {
  			writeRow(object, isFirst && isWriteKeyAsHead);
  			if (isFirst) {
  				isFirst = false;
  			}
  		}
  		return this;
  	}