[bmn__]

    perl -E'Unicode::Collate::Locale->new(locale => 'cs')->sort … … …'

works. Test cases at https://prirucka.ujc.cas.cz/?action=view&id=900

[mulmen]

I love some perl on Monday morning but how does this work when you don’t know the locale?

[bmn__]

Then a system should fall back to DUCET which produces more or less sensible results across all locales.