[3.13] gh-132713: Fix typing.Union[index] race condition (GH-132802) #132839
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Add union_init_parameters() helper function. Use a critical section
to initialize the 'parameters' member.
(cherry picked from commit dc3e963)
Co-authored-by: Victor Stinner vstinner@python.org
union_repr
fromlist_repr_impl
in free-threaded build #132713