But would a-z also include for example à and ä, or should 0-9 include ½? (The solution that glibc will implement is to un-interleave lowercase and uppercase ch

But would a-z also include for example à and ä, or should 0-9 include ½? (The solution that glibc will implement is to un-interleave lowercase and uppercase characters whenever the collation order is like aàAÀbBcC...).