Per @codeant-ai's review: the original now/2-days pair would let a string-
based sort pass the assertion, since 'n' > '2' lexically. Switched to
"3 hours ago" vs "5 hours ago" — lexical desc puts "5..." first while
timestamp desc must put "3..." first, so the two orderings actually
disagree and a regression to string-based sorting would fail the test.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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