hypothesis/dom-text-mapper — pull request #41 by nobarany (2014-04-17 21:28:09+00:00)
Title: dom_text_mapper:char 160-->32 (non-breaking space)

Apparently, spaces are not created equal. I'm not sure how, but I ended up with a text that had char 160 instead of char 32, and the mapper couldn't find the match.