Implement round-ties-to-even for Duration Debug for consistency with f64 #147499
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Summary
This PR proposes a fix for #103747 implementing IEEE-754 S4.3 roundTiesToEven for Duration Debug implementation.
Testing
Added new test in
time.rsfor validating roundTiesToEven behavior in Duration formatting. Reran all debug formatting tests intime.rswith./x test library/coretests --test-args time::debug_formatting.