translation of node names on Mac causes sync to mis-recognize identical files

On the Mac's HFS+ filesystem (the default), the character set is UTF-8 but characters are decomposed. I don't know much about it yet, but in Unicode calls this "Normalization Form D." The HTTP standards require "Normalization Form C" (composed). In my situation, the UTF-8 character é (latin small letter e acute) in my local filename is displayed on s3sync.rb's verbose and debug output as é but it is saved in S3 as eÌ (that's three characters: latin small letter e, latin capital letter I with grave, and unicode character 129 [0x81]).

This causes the comparisons to always fail, and the files are always re-synced unnecessarily (and the existing mis-named copies are deleted if s3sync.rb's --delete option is on).

Apple has patched libiconv to allow for a character set called UTF-8-MAC that is supposed to handle this situation. However, when I set S3SYNC_NATIVE_CHARSET=UTF-8-MAC, I still don't get the right results.

I'll try to do my best to work up a patch, but I am not a Ruby programmer! Let me know if you have any ideas or need more information.