Imagine a PDF with 2 pages. I want to print the 1st page 1 x, the 2nd page 2 times. Of course I can just click on "Actual" and print page 1, then browse to the 2nd page, increase the number of copies, click on "Actual" again and print the 2nd page twice.

But I would like to enter "1,2,2" into the pages input field. In fact, the preview then even shows three pages (1, 2, 2) and I can start printing. But then I get an error alert and not a single page of the entered ones is being printed. This seems to be a bug, because I can use the pages input field for any other selection and range of pages as long as a page isn't being printed twice.

I could even imagine an enhanced parsing of the Pages input field, e.g. if you enter "1,[2-3],[2-3]" this could mean that page 1 would be printed in single page mode, while pages 2-3 would be printed twice in duplex mode.