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@capnm - thx for the epub. There is no issue to do with nearness of the ISBN to the bottom of the page. In fact Extract ISBN does return a 10-digit ISBN when I run it. What it doesn't do is return the ISBN that you want - instead it returns the first one it finds, which is a few pages before that and refers to an audio edition of the book.
Were this a PDF, then it would be picking up the correct ISBN, as it checks the final pages of a book in reverse order.
Maybe it is time I try to apply that similar reverse scan logic to formats other than PDF, as you are not the first person to comment on it. The problem is that unlike a PDF, the way I access the text in an ePub is by iterating through the spine (manifest) of the book. So there is no concept of "pages", only of "files". Depending on how well the book is split, the last few "pages" might be in one file or in multiple files, in fact the whole book could be in one file. It is for the same reasons that I cannot apply the same logic of scanning only the first 10 "pages" like I do with PDFs.
So it all gets a bit messy and crude. Maybe I shall make it that I scan the very last page in reverse order first, and then scan the rest of the book in normal order.
I fixed the other bug you reported btw, as you said it doesn't really impact the functionality as such which is why no-one else noticed it but nice to get rid of the error nonetheless.
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