.cindex "&%uc%& expansion item"
This forces the letters in the string into upper-case.
-.vitem &*${utf8clean*&<&'utf-8 string'&>&*}*&
+.vitem &*${utf8clean:*&<&'string'&>&*}*&
.cindex "correction of invalid utf-8 sequences in strings"
.cindex "utf-8" "utf-8 sequences"
-.cindex "wrong utf-8"
+.cindex "incorrect utf-8"
.cindex "expansion" "utf-8 forcing"
.cindex "&%utf8clean%& expansion item"
This replaces any invalid utf-8 sequence in the string by the character &`?`&.