Filter for number of pages in book

Description of your request or bug report:

Sometimes when looking for the next book to read, you just want something short, or on the contrary you want a really long book that you can really dive into. So it’d be great to have an additional filter, particularly in general book search, to be able to filter books by their number of pages. Something like “above x number of pages” and “below x number of pages” or a general field that can be used with < and > (like on AO3).

AO3 example

Trello link: