How should page counts be determined? Should it be the last numbered page? What if there is an unnumbered page with content followed the numbered page? What about Roman numeral numbered pages that come before (or after!) Arabic numeral numbered pages (and thus not included in the Arabic numeral count)?

Goodreads has this guideline: https://help.goodreads.com/s/article/Librarian-Manual-Book-edit-page-number-of-pages – effectively "last (Arabic numeral) numbered page"