>> Yes, for example in my package's version 1.7 I plan to use >> `fontspec-patched.sty’. > > Hang on a sec — how urgent is this? This seems like a fairly drastic > step; there’s no problem for me to make a fontspec release on > demand… I don't consider it a drastic step but rather natural – I use other packages that need to be patched because the upstream versions have bugs (longtable) or missing features (ucharclasses) not fixed yet. > But I’d be happy to perform an update by the end of the week if this > was convenient for you. This would be nice indeed :-) But there is definitely no pressure from my side. I now know what to do. Werner  The bug I'm suffering (http://www.latex-project.org/cgi-bin/ltxbugs2html?pr=tools/3512) is present since more than 14 years, and the patch provided in the bug report gives better results (although not perfect).  An updated version should be fixed on its way to CTAN right now.