I have three indexes and only one is Chinese. If I needed a 'display sort' (i.e. I was going to show the index keys to the user) then I'd specialise my indexing class and use a native locale for the key type. However, in this case, the keys only need to be internally consistent between index creation (Perl) and consumption (C#). I was expecting that Unicode support between the two languages would be sufficiently mature that I could rely on the defined standard.
As it turns out, when I re-sorted the index in a debugging session in C# and then diffed the Perl index vs. the C# index, there were fewer differences than unreachable keys. A large block of mis-sorted entries were disrupting the binary search for proximate entries (including 'one') and then there were two or three Chinese characters which were sorting oddly between the two languages in a few places, which were causing the rest of the dead-ends.
By excluding these few entries during index creation, I now have 100% match.
If I get some time it'll be interesting to find out why those few characters are really being sorted in a different order. Might be a bug in either C# or Perl.
Anyway, thanks for your help.
perl -le "s,,reverse killer,e,y,rifle,lycra,,print"
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