d0bb7e1946
The problem occured due to lines like ``` 3400;<CJK Ideograph Extension A, First>;Lo;0;L;;;;;N;;;;; 4DB5;<CJK Ideograph Extension A, Last>;Lo;0;L;;;;;N;;;;; ``` in `UnicodeData.txt`, which the script previously interpreted as two characters, although it represents the whole range. Fixes #34318.