Prince for Books 20181010 seems willing to break lines immediately before an en-dash (U+2013) used to separate number ranges, unlike regular Prince. Example HTML attached.

We can work around this with prince-text-replace, but it seems odd to break before such a character.

1. endash.html‎ 92.6 kB

Thanks. My fault, I agree that that's an error. I'll get this into the next PfB build.