* Accents are getting removed from Unicode characters to generate similar "words".
* Non-latin characters which cannot be processed that way (eg. japanese, greek, russian, etc.) should not be filtered out at all otherwise files are erroneously skipped or detected as dupes if only some characters make it passed the filter.
* Starting from an arbitrary unicode codepoint (converted to decimal), above which we know it is pointless to try any sort of processing, we leave the characters as is.
* Fix#878.
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