Github user kinow commented on the issue:
https://github.com/apache/jena/pull/237
>The collator is applied multiple times so if there is a mixed set of
lang-tagged-literals this is inconsistent. It only applies to a
same-lang,same-lang comparison while it may also be called with same first
argument but different, different-lang argument at some other point in the sort.
> (...)
>We need to switch to sorting by an ordering of (lang, lex), not (lex,
lang), not just reorder within same-lang.
Thanks @afs ! Will try to update the pull request following the comments
here so far.
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