I don't think it would be even possible in the current implementation for the same reasons we cannot implement collations: keys and index entries are not compared as a list of fields but as one large byte string, so a type specific comparison routine is currently out.Why do you think collations are impossible?
You can always covert type specific ordering stuff into binary comprable form! For example, convert collated string into ordinal values. It can be done so that you can still use binary comparsion!
You can convert each unicode character (or two-character combo) into three byte ordinal value for the given collation sequence (as there are more ordinal numbers than characters because of some two-character combos, like 'CH' between 'H' and 'I' for czech collation sequence...)
and then happily compare byte-by-byte, yielding correct results...
Jan
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