Any thoughts on 2-in-1 characters (ꜳæꜵꜷꜹꜻꜽʤʣʥᴔꭁꭂʩǁʪɮʫʨꝷʦʧꜩɱᵯ) being confusable? eg. aa vs ꜳ. aa shouldn’t be confusable because it’s double ASCII.
Combining Marks (CM) modify how a character is presented:
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å = 61 30A(where30A is a CM) å = E5
NFC is responsible for collapsing these together, eg. they both normalize to E5. For some characters, there is no combined glyph, eg. e̊ = 65 30A has no corresponding single character form.
Multiple CM can be attached to the same character, eg. ã̰ = 61 303 330. NFC is responsible for putting the CM in a canonical order.
You can stack CM on characters, eg. ã̃̃̃̃̃̃̃̃̃ and a̰̰̰̰̰̰̰̰̰̰.
Some CM stack without any visual indication, eg. a̸ (1x) vs a̸̸̸̸̸̸̸̸̸̸ (10x).
a̸̸.eth ≠ a̸̸̸.eth ≠ a̸̸̸̸.eth = ...
There’s currently 500 registered names with CM. We could disallow some of the malicious ones (underscore-like or very small, etc.)? We could disallow stacking?