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Misc/NEWS.d/next/Core_and_Builtins/2025-10-17-18-03-12.gh-issue-139951.IdwM2O.rst
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+Fixes a regression in GC performance for a growing heap composed mostly of
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+small tuples.
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+
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+* Counts number of actually tracked objects, instead of trackable objects.
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+ This ensures that untracking tuples has the desired effect of reducing GC overhead
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+* Does not track most untrackable tuples during creation.
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+ This prevents large numbers of small tuples causing excessive GCs.
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