[dbfclark]

Luminoso cofounder here (we make ftfy, among other things). Our use case is fairly specific: a customer uploads text documents, often as a spreadsheet originally exported from someone else's tool, but doesn't think hard about the encodings involved, so in order to serve them well we have to fix whatever happened. Accordingly, we put the most effort into solving problems that happen for our English-centric, US-centric customer base; they're the most important problems for us (though Russian has also gotten some love, as you can see from the commit history). On top of that, making Asian language exports from other tools work correctly usually requires enough encoding-awareness to mitigate a bunch of the problem[1], so we see those problems less frequently.

That said, if you have examples where ftfy fails in any language, please submit them! We want this tool to work well, because anything that we can't fix will cause us to have egg on our faces with a customer someday...

[1]No peeking: how many format options in Excel's "Save As" dialog, excluding Excel formats, produce a document from which Unicode can be recreated accurately?