[DRE-maint] Bug#996297: Ruby 3 freezes Ranges by default

[Daniel Leidert]

The problem is caused by Ruby 3 freezing Ranges by default [1,2]. Thus the
tests try to handle already frozen objects and some code is not working as
well. I've forwarded the problem to upstream, but they have been inactive for
some time.

[1] https://bugs.ruby-lang.org/issues/15504
[2] https://github.com/ruby/ruby/pull/3583/files
-- 
Regards,
Daniel Leidert <dleidert at debian.org> | https://www.wgdd.de/
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