[3.13] gh-143543: Fix re-entrant use-after-free in itertools.groupby (GH-143738) #144627
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…ythonGH-143738) (cherry picked from commit a91b5c3) Co-authored-by: VanshAgarwal24036 <148854295+VanshAgarwal24036@users.noreply.github.com> Co-authored-by: Sergey B Kirpichev <skirpichev@gmail.com> Co-authored-by: Petr Viktorin <encukou@gmail.com>
This was referenced Feb 9, 2026
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(cherry picked from commit a91b5c3)
Co-authored-by: VanshAgarwal24036 148854295+VanshAgarwal24036@users.noreply.github.com
Co-authored-by: Sergey B Kirpichev skirpichev@gmail.com
Co-authored-by: Petr Viktorin encukou@gmail.com
itertools.groupbyvia re-entrant key comparison through__eq__#143543