> > Why it wouldn't work with different encodings? 
> 
> All the data in the index has to be of the same encoding.
> Can't very well index your window-1250 F0 character (a "d" with a line
> through it) and an 8859-1 F0 character ("eth, Icelandic") in the same
> index.  They are different characters.

What difference does it make? Both will be valid chars.