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docs: document Unicode behavior for Levenshtein - #70
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Summary
Document the Unicode representation used by the Levenshtein implementation.
The implementation uses Java
String.length()andcharAt(), so thecomparison operates on UTF-16 code units. Supplementary Unicode code points
represented by surrogate pairs can therefore occupy two sequence positions.
The documentation clarifies that this code-unit distance can differ from
Unicode code-point or grapheme-cluster distance.
No implementation behavior is changed.