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Unicode normalization/equivalence is half of what you want and UCAPI is probably the other half.

https://en.wikipedia.org/wiki/Unicode_equivalence https://www.casaba.com/products/UCAPI/

Those are interesting, especially the second one. I've read a little here and there about Unicode normalization before, but UCAPI does look like what I really wanted. However, seeing as UCAPI isn't free or even "listed price plans", I get the strong feeling that this will not see much pickup (at least until someone makes a free one).

There are plenty of free libraries that allow you to detect and compare strings with confusables

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